iridium production, economic allocation, proxy

Metadata & sources Methods, scope, reference years, publications, contributors, projects and funding.

Other

Supporting sources:

Kathryn Kingsbury; Pahola Thathiana Benavides (2021). Update of Platinum Production and Addition of Platinum-Group Metals (PGMs) to GREET 2021. https://greet.anl.gov/files/pgm_2021

Anglo American Platinum Limited (2020). Annual Results 2019. https://www.valterraplatinum.com/wp-content/uploads/2026/05/annual-results-booklet-2019.pdf

Anglo American Platinum Limited (2020). Environmental, social and governance report 2019. https://www.valterraplatinum.com/wp-content/uploads/2026/05/environmental-social-and-governance-report-2019.pdf

Anglo American Platinum Limited (2021). Environmental, social and governance report 2020. https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf

Mgciniwethu Khumalo (2021). The optimal milling and mainstream flotation circuit configuration for Mogalakwena Platreef ore. https://wiredspace.wits.ac.za/server/api/core/bitstreams/20fec466-23b6-4fb5-8c0d-f494ae3351fc/content

Walter Amos Ngobeni; Antoine F. Mulaba-Bafubiandi (2024). Alkaline gelatinised locust bean gum: alternative depressant for pyroxene and talc in Platreef ore (preprint, v1). https://doi.org/10.21203/rs.3.rs-4799524/v1

Réata Colyn; Kirthi Peramaul; Tyla Smith; Lenaldi Görgens; Alta van Dyk (2023). Mogalakwena Complex: Draft Scoping Report, February 2023. https://www.altavandykenvironmental.co.za/wp-content/uploads/MM-Draft-Scoping-Report.pdf

Ivan Muñoz; Anastasia Papadopoulou; Edith Buhl; Bo P. Weidema (2026). Joint production with multiple determining products: the case of platinum-group metals. https://doi.org/10.1007/s11367-026-02665-6

premise static economic-iridium engineering compiler (2026). https://github.com/polca/premise/blob/850286212ca71e44ebbc0c90909640a5c5db62ae/premise/data/additional_inventories/lci-iridium-economic-proxy.xlsx

Background database: ecoinvent / 3.12
Background system model: cut-off
Biosphere database: ecoinvent / 3.12

These are the stored source profiles for this version. Foreground methodology is recorded in Scientific metadata.

External references

Not provided.

Declarations describe this version's foreground inventory. Missing information is not evidence of a particular allocation method or data origin.

Source publication year: Not specified
Inventory reference year: Not specified
Foreground modelling approach: Not specified
Allocated product inventory: Yes
Allocation or multifunctionality treatment: Allocation economic
Inventory contributions: Not specified
Projects: Not specified
Funding: Not specified
Data period start year: 2015
Data period end year: 2019
Multifunctionality applicable: Yes
Methodology notes: The economic factor per kg iridium is 924.4 USD/troy ounce ÷ 0.0311034768 kg/troy ounce ÷ 5,018,995,769 USD annual basket. This pooled mean-price/mean-basket allocation differs from year-by-year allocation and excludes chrome and other products outside the inherited basket. GREET does not provide a separate market-allocated iridium inventory. Rounded source tables and ounce/ton denominators have documented ambiguities; the reconstruction retains the annual company TJ series. Fossil shares 2.55/3.72/0.23 are normalized over 6.5, with diesel split 96.3/3.7%. Historical supplier factors include 1.249925 MJ coal fuel and 1.052631579 MJ gas fuel per reference MJ service. Fuel supply and direct combustion are represented once through those services.

Khumalo's North-Concentrator pilot doses are 273/46/130/306 g/t for SIBX, Senkol 3, Senfroth 516 and Norilose 6064. The selected North share is 9.3/(9.3+4.2), from 2023 planning capacities, applied to mean combined Mogalakwena feed of 13.091 million t/year. That ratio is not observed 2015–2019 North throughput; offsite Baobab treatment is documented. Selected active fractions are 95/40/100/60%, although the 2024 preprint's SIBX table gives 93.5% versus 95% in its text. Commercial-versus-active dose basis remains uncertain. Sodium ethyl xanthate differs from SIBX; generic organophosphorus, short-chain polyether polyol and pure CMC are manufacturing proxies for specific formulated reagents, excluding unmodelled carriers and impurities.

The later company report supplies the missing 2019 SO₂ value of 21.97 kt. The current five-year mean is 20.534 kt: allocated 121.592762938 kg/kg iridium less 11.381825897 kg inherited direct utility emissions gives the retained foreground residual of 110.210937042 kg. Only direct utility SO₂ is subtracted, assuming it is included in the corporate total. The later 2019 total-water withdrawal changes from 25,894 to 25,094 ML; the separately used potable series of 7,642/6,142/9,433/12,327/14,408 ML is unchanged. Allocated potable water of 59,158.485383 kg less 165.078346 kg historical embedded softened water gives 58,993.407037 kg tap water. This assumes that boiler feed belongs to that potable budget and does not establish total withdrawal, return or net consumption. Missing 2015 NOx and incompatible company/utility boundaries preclude a balancing emission.

Current version 1.0.1 already contains 1 kg direct iridium resource per kg contained-metal output. This is a content-attributed lower bound, not economically scaled geological extraction, an assay or 100% recovery. Historical version 1.0.0 lacks the row. The later 2026 consequential study's 0.624 South African refining response plus 0.376 reduced consumption, avoided-disposal and fuel assumptions have a different boundary and do not amend this recipe. The separate PEM-stack reference purchases 0.8 kg iridium, but its declared 3.9 supplier profile differs from this 3.12 reference; actual binding, loading, purity, lifetime and recovery remain unverified.
Process type: Unit process: black box
System boundary: An economically allocated share of pooled corporate operating electricity/fuel services, selected North-Concentrator reagent manufacture, direct SO₂ residual and potable-water supply per kg iridium. A separate contained-metal resource lower bound is included. Complete purchased-concentrate mining, final-refinery chemicals, land occupation, waste treatment, water returns and reagent fate are not established.
Included life cycle stages: Manufacturing
Technology description: The recipe extends the supporting GREET pooled PGM model to an independent economic-iridium scenario. Annual company quantities are averaged, then allocated using the mean achieved iridium price and a published seven-product basket. Pilot flotation doses, later North/South concentrator capacities and later reagent formulations are transferred as engineering assumptions. The South African location represents a corporate pool that also includes Zimbabwe and purchased or toll-treated material.
Intended application: An explicitly qualified attributional engineering proxy for iridium supply under the retained historical corporate-price, basket, process-ownership and supplier assumptions.
Use limitations: Company means, pilot doses, planning capacities, formulation purities and supplier contracts come from different years and scales. They do not establish iridium-specific process measurements, current prices, causal refining response, complete coproduct coverage or chemical/toxicity equivalence. Source rounding, carrier ownership, recovery losses and complete mining/refining inventories remain uncertain. The later company report is a source update; no formal applicable erratum was independently identified in the earlier review. Archived preprint and DOI-status checks do not prove a complete amendment history. The later consequential study supplies no recovery or avoided-disposal credit for this attributional recipe. External supplier terms remain separate.
Data origins: Literature, Proxy

Other fields not yet completed (1)

Valid until year

Publications (9)

Citation: Kathryn Kingsbury; Pahola Thathiana Benavides (2021). Update of Platinum Production and Addition of Platinum-Group Metals (PGMs) to GREET 2021. https://greet.anl.gov/files/pgm_2021
Title: Update of Platinum Production and Addition of Platinum-Group Metals (PGMs) to GREET 2021
Url: https://greet.anl.gov/files/pgm_2021
Source type: Technical report
Publication year: 2021
Relation: Supporting source
Authors: Kathryn Kingsbury; Pahola Thathiana Benavides

Citation: Anglo American Platinum Limited (2020). Annual Results 2019. https://www.valterraplatinum.com/wp-content/uploads/2026/05/annual-results-booklet-2019.pdf
Title: Annual Results 2019
Url: https://www.valterraplatinum.com/wp-content/uploads/2026/05/annual-results-booklet-2019.pdf
Source type: Industry documentation
Publication year: 2020
Relation: Supporting source
Authors: Anglo American Platinum Limited

Citation: Anglo American Platinum Limited (2020). Environmental, social and governance report 2019. https://www.valterraplatinum.com/wp-content/uploads/2026/05/environmental-social-and-governance-report-2019.pdf
Title: Environmental, social and governance report 2019
Url: https://www.valterraplatinum.com/wp-content/uploads/2026/05/environmental-social-and-governance-report-2019.pdf
Source type: Industry documentation
Publication year: 2020
Relation: Supporting source
Authors: Anglo American Platinum Limited

Citation: Anglo American Platinum Limited (2021). Environmental, social and governance report 2020. https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf
Title: Environmental, social and governance report 2020
Url: https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf
Source type: Industry documentation
Publication year: 2021
Relation: Supporting source
Authors: Anglo American Platinum Limited

Citation: Mgciniwethu Khumalo (2021). The optimal milling and mainstream flotation circuit configuration for Mogalakwena Platreef ore. https://wiredspace.wits.ac.za/server/api/core/bitstreams/20fec466-23b6-4fb5-8c0d-f494ae3351fc/content
Title: The optimal milling and mainstream flotation circuit configuration for Mogalakwena Platreef ore
Url: https://wiredspace.wits.ac.za/server/api/core/bitstreams/20fec466-23b6-4fb5-8c0d-f494ae3351fc/content
Source type: Technical report
Publication year: 2021
Relation: Supporting source
Authors: Mgciniwethu Khumalo

Citation: Walter Amos Ngobeni; Antoine F. Mulaba-Bafubiandi (2024). Alkaline gelatinised locust bean gum: alternative depressant for pyroxene and talc in Platreef ore (preprint, v1). https://doi.org/10.21203/rs.3.rs-4799524/v1
Title: Alkaline gelatinised locust bean gum: alternative depressant for pyroxene and talc in Platreef ore (preprint, v1)
Doi: 10.21203/rs.3.rs-4799524/v1
Url: https://doi.org/10.21203/rs.3.rs-4799524/v1
Source type: Unpublished research
Publication year: 2024
Relation: Supporting source
Authors: Walter Amos Ngobeni; Antoine F. Mulaba-Bafubiandi

Citation: Réata Colyn; Kirthi Peramaul; Tyla Smith; Lenaldi Görgens; Alta van Dyk (2023). Mogalakwena Complex: Draft Scoping Report, February 2023. https://www.altavandykenvironmental.co.za/wp-content/uploads/MM-Draft-Scoping-Report.pdf
Title: Mogalakwena Complex: Draft Scoping Report, February 2023
Url: https://www.altavandykenvironmental.co.za/wp-content/uploads/MM-Draft-Scoping-Report.pdf
Source type: Technical report
Publication year: 2023
Relation: Supporting source
Authors: Réata Colyn; Kirthi Peramaul; Tyla Smith; Lenaldi Görgens; Alta van Dyk

Citation: Ivan Muñoz; Anastasia Papadopoulou; Edith Buhl; Bo P. Weidema (2026). Joint production with multiple determining products: the case of platinum-group metals. https://doi.org/10.1007/s11367-026-02665-6
Title: Joint production with multiple determining products: the case of platinum-group metals
Doi: 10.1007/s11367-026-02665-6
Url: https://doi.org/10.1007/s11367-026-02665-6
Source type: Scientific journal
Publication year: 2026
Relation: Supporting source
Authors: Ivan Muñoz; Anastasia Papadopoulou; Edith Buhl; Bo P. Weidema · 0000-0003-1863-6528

Citation: premise static economic-iridium engineering compiler (2026). https://github.com/polca/premise/blob/850286212ca71e44ebbc0c90909640a5c5db62ae/premise/data/additional_inventories/lci-iridium-economic-proxy.xlsx
Title: premise static economic-iridium engineering compiler
Url: https://github.com/polca/premise/blob/850286212ca71e44ebbc0c90909640a5c5db62ae/premise/data/additional_inventories/lci-iridium-economic-proxy.xlsx
Source type: Data repository
Publication year: 2026
Relation: Supporting source

Evidence and qualifications (29)

Target field: data_origins
Origin: Source import
Source reference: Existing published CLIC inventory documentation
Source location: source
Qualification: Tags describe documented input origins of this exact supplied version. Literature does not assert direct measurements; engineering and proxy tags describe stated assumptions, not validated industrial performance.

Target field: data_origins
Origin: Source import
Source reference: Existing published CLIC inventory documentation
Source location: description
Qualification: Tags describe documented input origins of this exact supplied version. Literature does not assert direct measurements; engineering and proxy tags describe stated assumptions, not validated industrial performance.

Target field: included_life_cycle_stages
Origin: Source import
Source reference: Existing published CLIC inventory documentation
Source location: name
Qualification: Minimum explicitly named stage(s); no assertion that all upstream/downstream stages of the cited study are present. Manufacturing rejects alone do not create an end-of-life stage.

Target field: use_limitations
Origin: Source import
Source reference: Existing published CLIC inventory documentation
Source location: description
Qualification: Copied version-specific scientific qualification; it remains applicable to this exact reconstruction and is not a claim about the source paper.

Target field: data_period_start_year
Origin: Source import
Source reference: Existing published CLIC inventory documentation
Source location: description
Qualification: Period of principal company quantities only; flotation, capacity and reagent assumptions use later sources documented separately. No representative inventory year is inferred.

Target field: data_period_end_year
Origin: Source import
Source reference: Existing published CLIC inventory documentation
Source location: description
Qualification: Period of principal company quantities only; not the full range of all supporting publications.

Target field: represents_allocated_product
Origin: Source import
Source reference: Existing published CLIC inventory documentation
Source location: description
Qualification: Allocation of the pooled seven-product corporate operating budget; minimum iridium resource content in 8846 is direct attribution, separately qualified, not the same economic allocation.

Target field: multifunctionality_applicable
Origin: Source import
Source reference: Existing published CLIC inventory documentation
Source location: description
Qualification: Allocation of the pooled seven-product corporate operating budget; minimum iridium resource content in 8846 is direct attribution, separately qualified, not the same economic allocation.

Target field: multifunctionality_methods
Origin: Source import
Source reference: Existing published CLIC inventory documentation
Source location: description
Qualification: Allocation of the pooled seven-product corporate operating budget; minimum iridium resource content in 8846 is direct attribution, separately qualified, not the same economic allocation.

Target field: process_type
Origin: Source import
Source reference: Existing published CLIC inventory documentation
Source location: inventory_snapshot/model
Qualification: Aggregated corporate-pool mining/refining engineering proxy, not a single measured operation.

Target field: system_boundary
Origin: Source import
Source reference: Existing published CLIC inventory documentation
Source location: description
Qualification: Explicit declaration in this supplied inventory.

Target field: publications
Origin: Editor verification
Source reference: https://greet.anl.gov/files/pgm_2021
Source location: provenance
Qualification: Partial iridium-production engineering reference using original corporate 2015–2019 pooled quantities and the supporting April 2021 GREET memo by Kathryn Kingsbury and Pahola Thathiana Benavides. GREET explicitly does not implement separate market-allocation inventories for iridium/ruthenium, while permitting mass-allocated PGM surrogates. This recipe is an independent economic extension, not a published GREET iridium table or measured single factory. Corporate report covers 2019/2020 differ from release years 2020/2021; current 2026 repository upload paths do not date the underlying measurements. Khumalo's signed 2020 report has a 2021 repository publication. The 2024 preprint and 2023 planning report are later source transfers. Source authors are not CLIC inventory compilers, and publication years do not replace the principal 2015–2019 company-data period.

Target field: methodology_notes
Origin: Editor verification
Source reference: https://www.valterraplatinum.com/wp-content/uploads/2026/05/environmental-social-and-governance-report-2019.pdf
Source location: energy
Qualification: Per kg iridium, the engineering economic factor is mean achieved Ir price 924.4 USD/troy ounce divided by 0.0311034768 kg/troy ounce and by the published 5018995769 USD annual seven-product basket. Product mass cancels in this per-kg formula; that algebra does not establish causal refining costs or a complete coproduct basket. It is a pooled average-price/average-basket scenario rather than year-by-year allocation. Chrome and other outputs are outside the inherited basket. Original annual electricity/fossil TJ series are averaged; fossil shares 2.55/3.72/0.23 are normalized over 6.5 and diesel split 96.3/3.7 percent is inherited from GREET. Literal rounded GREET tables and ounce/ton denominators have documented inconsistencies; do not rescale this reconstruction without confirming author intent and boundary. Retained historical supplier factors convert purchased fuel energy to service references, including coal 1.249925 and gas 1.052631579 MJ fuel per reference MJ. Fuel supply and direct combustion are owned once by those services; adding a second fuel or furnace process is unsupported. ZA is a geographic proxy for a corporate pool including Zimbabwe and purchased/toll-treated material. Complete upstream mining for purchased concentrate, supplier technology/reference years and actual export binding remain unresolved.

Target field: methodology_notes
Origin: Editor verification
Source reference: https://wiredspace.wits.ac.za/server/api/core/bitstreams/20fec466-23b6-4fb5-8c0d-f494ae3351fc/content
Source location: flotation
Qualification: Khumalo Table 3.2 gives North Concentrator pilot doses 273/46/130/306 g/t for SIBX/Senkol 3/Senfroth 516/Norilose 6064. The recipe applies their selected commercial-product interpretation only to North feed, inferred from the later 9.3/(9.3+4.2) Mtpa capacity ratio. Mean combined Mogalakwena feed is 13.091 million t/year; actual 2015–2019 North throughput is not measured by that 2023 planning ratio, and offsite Baobab treatment is documented. The 2024 preprint supports selected active fractions 95/40/100/60 percent but its SIBX text 95 percent conflicts with Table 1 93.5 percent. Both purity and commercial-versus-active dose basis remain scenarios. Sodium ethyl xanthate is a different alkyl-chain proxy for SIBX; a generic organophosphorus average is not actual dithiophosphate chemistry; short-chain polyether polyols are not a verified PPG 400 frother formulation; pure CMC excludes commercial carriers. Unmodelled commercial carrier/impurity mass and reagent environmental fate are not zero. No other-company ore recipe, waste treatment, dissolved release, toxicity equivalence or recovery credit is established by these manufacturing proxies.

Target field: methodology_notes
Origin: Editor verification
Source reference: https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf
Source location: water_resource
Qualification: The 2020 ESG report printed 70 supplies previously missing 2019 SO2 at 21.97 kt; the existing foreground residual already uses the five-year 20.534 kt mean. Allocated target 121.592762938 kg/kg Ir less inherited direct utility SO2 11.381825897 gives current 110.210937042 kg. Subtract direct utility emissions once, not upstream supplier emissions; this assumes the corporate total includes utility combustion and uses historical provider evidence. Later 2019 total water withdrawal 25094 ML differs from 25894 ML in the 2019 report, but the separately used potable series 7642/6142/9433/12327/14408 ML is unchanged. Its allocated 59158.485383 kg less historical embedded softened water 165.078346 kg gives current 58993.407037 kg tap water. Boiler feed belonging to this potable budget remains an assumption; this is not complete withdrawal, return or net-consumption accounting. Corporate NOx has missing 2015 data and incompatible known-year/utility boundaries; do not turn missing values into zero or add a negative balancing emission. Published version 1.0.1 already contains 1 kg direct Ir-resource lower bound for 1 kg contained-metal output. It is not economically scaled extraction, observed purity, ore grade or 100 percent recovery. Historical 1.0.0 lacks that row; do not apply the resource addition again to the current version. Mining/refining losses, final-refinery chemicals, land and complete waste treatment remain unresolved.

Target field: publications
Origin: Editor verification
Source reference: https://greet.anl.gov/files/pgm_2021
Source location: entities
Qualification: Verify Argonne, University of the Witwatersrand, University of Johannesburg, Aalborg and Danish Topsoe identities against exact country/identifier records. Wits and UJ are distinct universities. The GREET byline's Systems Assessment Group/Energy Systems Division are Argonne units; its SULI training programme, DOE Office of Science and workforce-development office are related programme/agency roles, not duplicate institutions or verified grants for CLIC. Khumalo acknowledges Mogalakwena management funding and Anglo Research technical support; supervisor and technicians are not coauthors. Preserve historical Anglo American Platinum issuer, operating-client Rustenburg Platinum Mines and current Valterra repository-host roles without automatic legal merger. AECI/Senmin supplier branding, AvD consultant/preparer and mining-client roles are distinct. New 2026 main-paper department and supplementary DCEA are related Aalborg units. The article identifies Aalborg open-access support; generic Crossmark funding must not broaden that to verified inventory-research or CLIC funding. Keep CLIC authors, contributors, institutions, projects and funding arrays unchanged.

Target field: publications
Origin: Editor verification
Source reference: https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf
Source location: updates
Qualification: The later corporate report adds missing SO2 and changes total water withdrawal, while no new correction to the separately used potable series is established. This source update is reflected in the SO2 target; a formal erratum was not independently identified. Original preprint version 1 is posted 22 August 2024; fresh page state lists no version of record, associated publication or amendment, which does not prove a complete amendment history. The same authors' cassia-tora/locust-bean paper is a different study. Exact DOI Crossmark reports the 2026 Muñoz/Papadopoulou/Buhl/Weidema paper current, but complete supplementary history remains unproven. Its SI sections 3.8/4.8 reconstruct a refining-only consequential response using older refinery data and avoided residue disposal; Table SM 18 combines 0.624 ZA refining response and 0.376 reduced consumption per kg Ir. Those boundary, substitution and fuel assumptions do not correct or replace this attributional corporate-pool recipe. Current PEM stack 4856 buys 0.8 kg Ir, as in the pinned native caller, but has 3.9 declarations versus this 3.12 provider; actual migration/binding, loading, purity, stack life and recovery remain unverified. No extra lifetime multiplier, disposal credit or current amount correction is established. Static arithmetic agreement is not full inventory or scientific sign-off.

Target field: technology_description
Origin: Editor verification
Source reference: https://zenodo.org/records/23935622
Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review
Qualification: Technical-characterisation review TC-3654. Design capacity: Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan.

Target field: technology_description
Origin: Editor verification
Source reference: https://zenodo.org/records/23935622
Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review
Qualification: Technical-characterisation review TC-3654. Design capacity unit: Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan.

Target field: technology_description
Origin: Editor verification
Source reference: https://zenodo.org/records/23935622
Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review
Qualification: Technical-characterisation review TC-3654. Capacity factor (%): Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan.

Target field: technology_description
Origin: Editor verification
Source reference: https://zenodo.org/records/23935622
Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review
Qualification: Technical-characterisation review TC-3654. Annual production volume: Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan.

Target field: technology_description
Origin: Editor verification
Source reference: https://zenodo.org/records/23935622
Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review
Qualification: Technical-characterisation review TC-3654. Annual production volume unit: Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan.

Target field: technology_description
Origin: Editor verification
Source reference: https://zenodo.org/records/23935622
Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review
Qualification: Technical-characterisation review TC-3654. Annual production volume year: Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan.

Target field: technology_description
Origin: Editor verification
Source reference: https://zenodo.org/records/23935622
Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review
Qualification: Technical-characterisation review TC-3654. Plant or represented-asset lifetime (years): Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan.

Target field: technology_description
Origin: Editor verification
Source reference: https://zenodo.org/records/23935622
Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review
Qualification: Technical-characterisation review TC-3654. Commercial maturity stage: Unspecified. Basis: Leave exact commercial maturity and numerical TRL unspecified. Ideal chemistry, experimental assays, source industrial ancestry or conventional constituents alone do not establish deployment of this complete mixed engineering recipe or a source-assigned exact readiness level. Evidence classification: source scope and explicit curator assessment. Confidence: medium curator judgement. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan.

Target field: technology_description
Origin: Editor verification
Source reference: https://zenodo.org/records/23935622
Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review
Qualification: Technical-characterisation review TC-3654. Technology readiness level: Unspecified. Basis: Leave exact commercial maturity and numerical TRL unspecified. Ideal chemistry, experimental assays, source industrial ancestry or conventional constituents alone do not establish deployment of this complete mixed engineering recipe or a source-assigned exact readiness level. Evidence classification: source scope and explicit curator assessment. Confidence: medium curator judgement. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan.

Target field: technology_description
Origin: Editor verification
Source reference: https://zenodo.org/records/23935622
Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review
Qualification: Technical-characterisation review TC-3654. Technological representativeness: 5. Basis: Curator technology/geography/time 5/4/4 for idealized, reconstructed or transferred process scope and supplier/observation limitations. Preserve worse prior ratings. Mixed source dates, specimen tests and reports do not establish a measured whole-inventory period; corporate-pool geography is not a single South-African installation. Evidence classification: source scope and explicit curator assessment. Confidence: medium curator judgement. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan.

Target field: technology_description
Origin: Editor verification
Source reference: https://zenodo.org/records/23935622
Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review
Qualification: Technical-characterisation review TC-3654. Geographical representativeness: 4. Basis: Curator technology/geography/time 5/4/4 for idealized, reconstructed or transferred process scope and supplier/observation limitations. Preserve worse prior ratings. Mixed source dates, specimen tests and reports do not establish a measured whole-inventory period; corporate-pool geography is not a single South-African installation. Evidence classification: source scope and explicit curator assessment. Confidence: medium curator judgement. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan.

Target field: technology_description
Origin: Editor verification
Source reference: https://zenodo.org/records/23935622
Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review
Qualification: Technical-characterisation review TC-3654. Temporal representativeness: 4. Basis: Curator technology/geography/time 5/4/4 for idealized, reconstructed or transferred process scope and supplier/observation limitations. Preserve worse prior ratings. Mixed source dates, specimen tests and reports do not establish a measured whole-inventory period; corporate-pool geography is not a single South-African installation. Evidence classification: source scope and explicit curator assessment. Confidence: medium curator judgement. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan.

Technology characterization Scale, utilization, production, lifetime, technology readiness and representativeness.

Commercial maturity stage: Not provided

Design capacity: Not provided

Design capacity unit: Not provided

Capacity factor: Not provided

Annual production volume: Not provided

Annual production volume unit: Not provided

Annual production volume year: Not provided

Plant lifetime: Not provided

Technology readiness level Not assessed

Technological representativeness

Geographical representativeness

Temporal representativeness

Missing exchange uncertainty generation: Not requested

Representativeness scores use a 1–5 scale when provided. Lower scores indicate a closer fit to the modeled technology, geography, or time period.

Inventory & impacts 13 exchanges · exchange table, supply-chain graph and environmental screening.

Precalculated screening profile

Environmental impacts

Results per kilogram, using UVEK 2025 and the ecoinvent 3.10 biosphere. Exchange rows are shaded from green to red by relative contribution to the selected indicator.

Exchange impact indicator (EF v3.1)

Climate change 30867.2 kg CO2-Eq / kilogram

Screening result

This screening result uses Brightpath mappings from the source background to UVEK 2025; mapped suppliers are not claims of scientific equivalence.

Show all 16 indicator totals

Acidification 207.143 mol H+-Eq / kilogram

Climate change 30867.2 kg CO2-Eq / kilogram

Freshwater ecotoxicity 66472.8 CTUe / kilogram

Freshwater eutrophication 15.8917 kg P-Eq / kilogram

Marine eutrophication 16.9297 kg N-Eq / kilogram

Terrestrial eutrophication 166.505 mol N-Eq / kilogram

Human toxicity, cancer 1.2350e-05 CTUh / kilogram

Human toxicity, non-cancer 9.7048e-05 CTUh / kilogram

Ionising radiation 2286.72 kBq U235-Eq / kilogram

Land use 48475.9 dimensionless / kilogram

Ozone depletion 0.000138219 kg CFC-11-Eq / kilogram

Particulate matter 0.000594073 disease incidence / kilogram

Photochemical ozone formation 53.7669 kg NMVOC-Eq / kilogram

Resource use, fossils 313972 MJ, net calorific value / kilogram

Resource use, minerals and metals 0.00727194 kg Sb-Eq / kilogram

Water use 185844 m3 world Eq deprived / kilogram

Calculation details

Profile uvek-2025-ef-v3-1-4e70d56a85b1 · artifact 4e70d56a85b1 · calculated 2026-11-03 09:12 UTC. These screening results do not replace a reviewed comparative LCA.

Reference flow 1 row Reference production exchanges extracted from the uploaded inventory.

Exchange	Reference / categories	Amount	Unit	Metadata	Climate change contribution
iridium production, economic allocation, proxy ZA	iridium	1	kilogram	-	Reference flow

Emissions 1 row Elementary flows emitted from the dataset to the environment.

Exchange	Reference / categories	Amount	Unit	Metadata	Climate change contribution
Sulfur dioxide	air / non-urban air or from high stacks	110.21	kilogram	Metadata (1) Comment Qualified residual to match the pooled 2015-2019 reported direct SO2 total under economic allocation after subtracting the native energy services' direct SO2 across air compartments. Assumes the corporate reporting scope includes this utility combustion. Remaining emission assigned to smelter/refinery stacks. Not measured Ir-specific emissions; upstream emissions remain in suppliers once.	0 kg CO2-Eq / kilogram 0.0% of total EF biosphere factor

Technosphere inputs 10 rows Linked foreground or background product inputs used by this dataset.

Exchange	Reference / categories	Amount	Unit	Metadata	Climate change contribution
market for electricity, medium voltage ZA	electricity, medium voltage	2.60e+04	kilowatt hour	Metadata (1) Comment Draft electricity proxy; source purchased energy converted to the native provider's reference basis. Fuel supply/combustion included once. See feasibility report.	26736.2 kg CO2-Eq / kilogram 86.6% of total BAFU:2025
diesel, burned in building machine GLO	diesel, burned in building machine	1.45e+04	megajoule	Metadata (1) Comment Draft mining_diesel proxy; source purchased energy converted to the native provider's reference basis. Fuel supply/combustion included once. See feasibility report.	1520.33 kg CO2-Eq / kilogram 4.9% of total BAFU:2025
diesel, burned in diesel-electric generating set, 10MW GLO	diesel, burned in diesel-electric generating set, 10MW	557.37	megajoule	Metadata (1) Comment Draft stationary_diesel proxy; source purchased energy converted to the native provider's reference basis. Fuel supply/combustion included once. See feasibility report.	52.3882 kg CO2-Eq / kilogram 0.2% of total BAFU:2025
heat production, at hard coal industrial furnace 1-10MW RoW	heat, district or industrial, other than natural gas	1.76e+04	megajoule	Metadata (1) Comment Draft coal proxy; source purchased energy converted to the native provider's reference basis. Fuel supply/combustion included once. See feasibility report.	2345.21 kg CO2-Eq / kilogram 7.6% of total BAFU:2025
heat production, natural gas, at industrial furnace >100kW RoW	heat, district or industrial, natural gas	1292.74	megajoule	Metadata (1) Comment Draft natural_gas proxy; source purchased energy converted to the native provider's reference basis. Fuel supply/combustion included once. See feasibility report.	103.759 kg CO2-Eq / kilogram 0.3% of total BAFU:2025
market for sodium ethyl xanthate GLO	sodium ethyl xanthate	13.85	kilogram	Metadata (1) Comment SIBX active mass represented by sodium ethyl xanthate at 1:1 kg. Different alkyl chain; functional manufacturing proxy, not chemical equivalence or evidence for field emissions or equivalent environmental impacts. Reagent dose basis: commercial; North-only capacity-share engineering scenario. Amounts are generated from the separately recorded model parameters.	27.322 kg CO2-Eq / kilogram 0.1% of total BAFU:2025
market for organophosphorus-compound, unspecified GLO	organophosphorus-compound, unspecified	0.98	kilogram	Metadata (1) Comment Senkol3 active sodium diethyl dithiophosphate represented at 1:1 kg by a generic organophosphorus manufacturing average. Native average includes insecticide-related substances; a weak production proxy, not actual Senkol3 chemistry, impurity, release, pesticide use or toxicity. Reagent dose basis: commercial; North-only capacity-share engineering scenario. Amounts are generated from the separately recorded model parameters.	5.964 kg CO2-Eq / kilogram 0.0% of total BAFU:2025
market for polyether polyols, short chain RoW	polyether polyols, short chain	6.94	kilogram	Metadata (1) Comment Senfroth516 PPG400 mixture represented at 1:1 kg by native short-chain polyether polyols (<1000 g/mol). Native polyurethane feedstock is not a verified frother formulation; manufacture only, not field-release chemistry. Reagent dose basis: commercial; North-only capacity-share engineering scenario. Amounts are generated from the separately recorded model parameters.	26.3829 kg CO2-Eq / kilogram 0.1% of total BAFU:2025
market for carboxymethyl cellulose, powder GLO	carboxymethyl cellulose, powder	9.8	kilogram	Metadata (1) Comment Norilose6064 represented by pure CMC powder at active mass. Commercial-grade impurities/carriers remain unmodelled and explicitly quantified. Reagent dose basis: commercial; North-only capacity-share engineering scenario. Amounts are generated from the separately recorded model parameters.	41.6639 kg CO2-Eq / kilogram 0.1% of total BAFU:2025
market for tap water ZA	tap water	5.90e+04	kilogram	Metadata (1) Comment Corporate purchased potable water less native coal-service softened-water input, assuming that embedded boiler feed originates from the reported potable budget and 1 kg water corresponds to 1 litre. Native softening and its upstream burdens remain included once. This does not close the site's water/return balance or establish net water consumption. Reagent dose basis: commercial; North-only capacity-share engineering scenario. Amounts are generated from the separately recorded model parameters.	7.94985 kg CO2-Eq / kilogram 0.0% of total BAFU:2025

Natural resources 1 row Elementary flows withdrawn from the environment by this dataset.

Exchange	Reference / categories	Amount	Unit	Metadata	Climate change contribution
Iridium	natural resource / in ground	1	kilogram	Metadata (2) Comment Minimum contained-iridium resource accounting: the reference output is modelled as 1 kg of contained iridium metal, so at least 1 kg of Ir resource is attributed directly to that output. This is a content-based lower-bound assumption, not measured ore extraction, assay purity, or 100% recovery. Additional extraction associated with mining/refining losses remains unquantified. The resource is not multiplied by the price/basket allocation factor; economic allocation of shared operating inputs and the SO2 residual remains unchanged. No other metal resource or recycling credit is added. Uncertainty type 0	0 kg CO2-Eq / kilogram 0.0% of total EF biosphere factor

Parameters 0 source definitions · values, formulas and uncertainty.

Read-only definitions preserved with this inventory version. Values are supplied by the source; CLIC does not evaluate formulas or recalculate exchange amounts and impact scores from them.

No parameter definitions were supplied with this inventory snapshot.

Versions & changes 2 versions · change rationale, release notes and comparisons.

Oldest to newest. Arrows show recorded revision links; each node describes the change introduced by that version.

Version 1.0.0
Published 2026-11-03

This iridium production, economic allocation, proxy reference makes its product and manufacturing boundary explicit. Its supplied inputs include electricity, medium voltage, diesel, burned in…
Superseded
Version 1.0.1
Published 2026-11-03

Add the missing iridium natural-resource input: 1 kg per kg of iridium metal. This accounts for the minimum iridium contained in the product; additional…
Published · Viewing · Latest

Show full version history table (2 versions)

Version	Published	Reason for this version	Link
Version 1.0.1	2026-11-03	Add the missing iridium natural-resource input: 1 kg per kg of iridium metal. This accounts for the minimum iridium contained in the product; additional extraction associated with mining or refining losses remains unquantified. Economic allocation of shared operating inputs and emissions is unchanged.	Current view
Version 1.0.0 Superseded	Published 2026-11-03	This iridium production, economic allocation, proxy reference makes its product and manufacturing boundary explicit. Its supplied inputs include electricity, medium voltage, diesel, burned in building machine, diesel, burned in diesel-electric generating set, 10MW.	Open version

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About this version

Why this version changed

Add the missing iridium natural-resource input: 1 kg per kg of iridium metal. This accounts for the minimum iridium contained in the product; additional extraction associated with mining or refining losses remains unquantified. Economic allocation of shared operating inputs and emissions is unchanged.

Changes from version 1.0.0 Compare this version with its predecessor. Exchanges are grouped by type and change; biosphere labels include their environmental compartments. Open the base version. Show changes Hide changes

Why this version changed

Add the missing iridium natural-resource input: 1 kg per kg of iridium metal. This accounts for the minimum iridium contained in the product; additional extraction associated with mining or refining losses remains unquantified. Economic allocation of shared operating inputs and emissions is unchanged.

Public revision record

This comparison is permanently visible with the published version so users can assess every detected change before reuse.

Modified exchanges: 0
Added exchanges: 1
Removed exchanges: 0
Inventory metadata: 2
Version metadata: 11

Biosphere exchanges added 1

Biosphere exchanges added
Exchange / scope	Field	Previous value	Revised value	Reason
Iridium (biosphere / natural resource / in ground / kilogram)	Amount	Not present	1.0 kilogram	Minimum contained-iridium resource accounting: the reference output is modelled as 1 kg of contained iridium metal, so at least 1 kg of Ir resource is attributed directly to that output. This is a content-based lower-bound assumption, not measured ore extraction, assay purity, or 100% recovery. Additional extraction associated with mining/refining losses remains unquantified. The resource is not multiplied by the price/basket allocation factor; economic allocation of shared operating inputs and the SO2 residual remains unchanged. No other metal resource or recycling credit is added.

Metadata changes 13

Metadata changes
Exchange / scope	Field	Previous value	Revised value	Reason
Inventory file	Description	Qualified partial inventory for supplying 1 kg of iridium metal at the producer gate. Uses pooled PGM mining, concentration, smelting and refining purchased-energy data for 2015-2019, extended to iridium by economic allocation. Includes delivered electricity, fuel supply and combustion, a residual to match reported corporate direct SO2, four North-Concentrator flotation-chemical manufacturing proxies and additional purchased potable water. Background: ecoinvent 3.12 cut-off. ZA is a geographical proxy for the operator pool, which also includes Zimbabwe. This is independently constructed foreground data, not an ecoinvent dataset or a certified complete iridium inventory. Metal purity, commercial form and Ir-specific recovery are unspecified.	Qualified partial inventory for supplying 1 kg of iridium metal at the producer gate. Uses pooled PGM mining, concentration, smelting and refining purchased-energy data for 2015-2019, extended to iridium by economic allocation. Includes delivered electricity, fuel supply and combustion, a residual to match reported corporate direct SO2, four North-Concentrator flotation-chemical manufacturing proxies and additional purchased potable water. Background: ecoinvent 3.12 cut-off. ZA is a geographical proxy for the operator pool, which also includes Zimbabwe. This is independently constructed foreground data, not an ecoinvent dataset or a certified complete iridium inventory. Metal purity, commercial form and Ir-specific recovery are unspecified. Includes minimum contained-Ir resource accounting; extraction associated with recovery losses remains unquantified.	Explain the minimum contained-iridium resource input and the unquantified recovery losses, while retaining the existing system boundary, sources and allocation.
Version metadata	Description	Partial engineering inventory for 1 kg iridium at the producer gate, economically allocating 2015–2019 corporate PGM operating quantities using a mean achieved Ir price and published seven-product basket. Includes delivered electricity/fuel services, a corporate SO2 residual, four North-Concentrator flotation-manufacturing proxies and additional potable water. Pilot doses, later capacity share and reagent active fractions remain qualified transfers; final-refinery chemistry and full mining/emission/waste/water coverage are incomplete. This historical version lacks the later contained-Ir resource row; absence is not zero geological extraction.	Partial producer-gate inventory per 1 kg iridium. The engineering model economically allocates pooled 2015–2019 platinum-group-metal company operating quantities and adds qualified flotation-reagent proxies. It covers delivered electricity/fuel services, an allocated direct SO₂ residual, additional potable water and a contained-iridium resource lower bound. Final refining chemistry and complete mining, emission, waste and water coverage remain unresolved.
Inventory file	Model version	1.0.0	1.0.1	Advance the model version to 1.0.1 to identify the inventory with the newly added resource input.
Version metadata	Geographical representativeness	Not set	4	No explanation was recorded for this change.
Version metadata	Intended application	Transparent attributional economic iridium proxy for the declared historical corporate pool. Review coproduct coverage, actual provider migration, refinery chemistry, geographic/temporal transfer, water/emission ownership, recovery and price/dose uncertainty before comparative use.	An explicitly qualified attributional engineering proxy for iridium supply under the retained historical corporate-price, basket, process-ownership and supplier assumptions.
Version metadata	Methodology and allocation explanation	Partial iridium-production engineering reference using original corporate 2015–2019 pooled quantities and the supporting April 2021 GREET memo by Kathryn Kingsbury and Pahola Thathiana Benavides. GREET explicitly does not implement separate market-allocation inventories for iridium/ruthenium, while permitting mass-allocated PGM surrogates. This recipe is an independent economic extension, not a published GREET iridium table or measured single factory. Corporate report covers 2019/2020 differ from release years 2020/2021; current 2026 repository upload paths do not date the underlying measurements. Khumalo's signed 2020 report has a 2021 repository publication. The 2024 preprint and 2023 planning report are later source transfers. Source authors are not CLIC inventory compilers, and publication years do not replace the principal 2015–2019 company-data period. Per kg iridium, the engineering economic factor is mean achieved Ir price 924.4 USD/troy ounce divided by 0.0311034768 kg/troy ounce and by the published 5018995769 USD annual seven-product basket. Product mass cancels in this per-kg formula; that algebra does not establish causal refining costs or a complete coproduct basket. It is a pooled average-price/average-basket scenario rather than year-by-year allocation. Chrome and other outputs are outside the inherited basket. Original annual electricity/fossil TJ series are averaged; fossil shares 2.55/3.72/0.23 are normalized over 6.5 and diesel split 96.3/3.7 percent is inherited from GREET. Literal rounded GREET tables and ounce/ton denominators have documented inconsistencies; do not rescale this reconstruction without confirming author intent and boundary. Retained historical supplier factors convert purchased fuel energy to service references, including coal 1.249925 and gas 1.052631579 MJ fuel per reference MJ. Fuel supply and direct combustion are owned once by those services; adding a second fuel or furnace process is unsupported. ZA is a geographic proxy for a corporate pool including Zimbabwe and purchased/toll-treated material. Complete upstream mining for purchased concentrate, supplier technology/reference years and actual export binding remain unresolved. Khumalo Table 3.2 gives North Concentrator pilot doses 273/46/130/306 g/t for SIBX/Senkol 3/Senfroth 516/Norilose 6064. The recipe applies their selected commercial-product interpretation only to North feed, inferred from the later 9.3/(9.3+4.2) Mtpa capacity ratio. Mean combined Mogalakwena feed is 13.091 million t/year; actual 2015–2019 North throughput is not measured by that 2023 planning ratio, and offsite Baobab treatment is documented. The 2024 preprint supports selected active fractions 95/40/100/60 percent but its SIBX text 95 percent conflicts with Table 1 93.5 percent. Both purity and commercial-versus-active dose basis remain scenarios. Sodium ethyl xanthate is a different alkyl-chain proxy for SIBX; a generic organophosphorus average is not actual dithiophosphate chemistry; short-chain polyether polyols are not a verified PPG 400 frother formulation; pure CMC excludes commercial carriers. Unmodelled commercial carrier/impurity mass and reagent environmental fate are not zero. No other-company ore recipe, waste treatment, dissolved release, toxicity equivalence or recovery credit is established by these manufacturing proxies. The 2020 ESG report printed 70 supplies previously missing 2019 SO2 at 21.97 kt; the existing foreground residual already uses the five-year 20.534 kt mean. Allocated target 121.592762938 kg/kg Ir less inherited direct utility SO2 11.381825897 gives current 110.210937042 kg. Subtract direct utility emissions once, not upstream supplier emissions; this assumes the corporate total includes utility combustion and uses historical provider evidence. Later 2019 total water withdrawal 25094 ML differs from 25894 ML in the 2019 report, but the separately used potable series 7642/6142/9433/12327/14408 ML is unchanged. Its allocated 59158.485383 kg less historical embedded softened water 165.078346 kg gives current 58993.407037 kg tap water. Boiler feed belonging to this potable budget remains an assumption; this is not complete withdrawal, return or net-consumption accounting. Corporate NOx has missing 2015 data and incompatible known-year/utility boundaries; do not turn missing values into zero or add a negative balancing emission. Published version 1.0.1 already contains 1 kg direct Ir-resource lower bound for 1 kg contained-metal output. It is not economically scaled extraction, observed purity, ore grade or 100 percent recovery. Historical 1.0.0 lacks that row; do not apply the resource addition again to the current version. Mining/refining losses, final-refinery chemicals, land and complete waste treatment remain unresolved. Verify Argonne, University of the Witwatersrand, University of Johannesburg, Aalborg and Danish Topsoe identities against exact country/identifier records. Wits and UJ are distinct universities. The GREET byline's Systems Assessment Group/Energy Systems Division are Argonne units; its SULI training programme, DOE Office of Science and workforce-development office are related programme/agency roles, not duplicate institutions or verified grants for CLIC. Khumalo acknowledges Mogalakwena management funding and Anglo Research technical support; supervisor and technicians are not coauthors. Preserve historical Anglo American Platinum issuer, operating-client Rustenburg Platinum Mines and current Valterra repository-host roles without automatic legal merger. AECI/Senmin supplier branding, AvD consultant/preparer and mining-client roles are distinct. New 2026 main-paper department and supplementary DCEA are related Aalborg units. The article identifies Aalborg open-access support; generic Crossmark funding must not broaden that to verified inventory-research or CLIC funding. Keep CLIC authors, contributors, institutions, projects and funding arrays unchanged. The later corporate report adds missing SO2 and changes total water withdrawal, while no new correction to the separately used potable series is established. This source update is reflected in the SO2 target; a formal erratum was not independently identified. Original preprint version 1 is posted 22 August 2024; fresh page state lists no version of record, associated publication or amendment, which does not prove a complete amendment history. The same authors' cassia-tora/locust-bean paper is a different study. Exact DOI Crossmark reports the 2026 Muñoz/Papadopoulou/Buhl/Weidema paper current, but complete supplementary history remains unproven. Its SI sections 3.8/4.8 reconstruct a refining-only consequential response using older refinery data and avoided residue disposal; Table SM 18 combines 0.624 ZA refining response and 0.376 reduced consumption per kg Ir. Those boundary, substitution and fuel assumptions do not correct or replace this attributional corporate-pool recipe. Current PEM stack 4856 buys 0.8 kg Ir, as in the pinned native caller, but has 3.9 declarations versus this 3.12 provider; actual migration/binding, loading, purity, stack life and recovery remain unverified. No extra lifetime multiplier, disposal credit or current amount correction is established. Static arithmetic agreement is not full inventory or scientific sign-off.	The economic factor per kg iridium is 924.4 USD/troy ounce ÷ 0.0311034768 kg/troy ounce ÷ 5,018,995,769 USD annual basket. This pooled mean-price/mean-basket allocation differs from year-by-year allocation and excludes chrome and other products outside the inherited basket. GREET does not provide a separate market-allocated iridium inventory. Rounded source tables and ounce/ton denominators have documented ambiguities; the reconstruction retains the annual company TJ series. Fossil shares 2.55/3.72/0.23 are normalized over 6.5, with diesel split 96.3/3.7%. Historical supplier factors include 1.249925 MJ coal fuel and 1.052631579 MJ gas fuel per reference MJ service. Fuel supply and direct combustion are represented once through those services. Khumalo's North-Concentrator pilot doses are 273/46/130/306 g/t for SIBX, Senkol 3, Senfroth 516 and Norilose 6064. The selected North share is 9.3/(9.3+4.2), from 2023 planning capacities, applied to mean combined Mogalakwena feed of 13.091 million t/year. That ratio is not observed 2015–2019 North throughput; offsite Baobab treatment is documented. Selected active fractions are 95/40/100/60%, although the 2024 preprint's SIBX table gives 93.5% versus 95% in its text. Commercial-versus-active dose basis remains uncertain. Sodium ethyl xanthate differs from SIBX; generic organophosphorus, short-chain polyether polyol and pure CMC are manufacturing proxies for specific formulated reagents, excluding unmodelled carriers and impurities. The later company report supplies the missing 2019 SO₂ value of 21.97 kt. The current five-year mean is 20.534 kt: allocated 121.592762938 kg/kg iridium less 11.381825897 kg inherited direct utility emissions gives the retained foreground residual of 110.210937042 kg. Only direct utility SO₂ is subtracted, assuming it is included in the corporate total. The later 2019 total-water withdrawal changes from 25,894 to 25,094 ML; the separately used potable series of 7,642/6,142/9,433/12,327/14,408 ML is unchanged. Allocated potable water of 59,158.485383 kg less 165.078346 kg historical embedded softened water gives 58,993.407037 kg tap water. This assumes that boiler feed belongs to that potable budget and does not establish total withdrawal, return or net consumption. Missing 2015 NOx and incompatible company/utility boundaries preclude a balancing emission. Current version 1.0.1 already contains 1 kg direct iridium resource per kg contained-metal output. This is a content-attributed lower bound, not economically scaled geological extraction, an assay or 100% recovery. Historical version 1.0.0 lacks the row. The later 2026 consequential study's 0.624 South African refining response plus 0.376 reduced consumption, avoided-disposal and fuel assumptions have a different boundary and do not amend this recipe. The separate PEM-stack reference purchases 0.8 kg iridium, but its declared 3.9 supplier profile differs from this 3.12 reference; actual binding, loading, purity, lifetime and recovery remain unverified.
Version metadata	Source	Supporting sources: Kathryn Kingsbury; Pahola Thathiana Benavides (2021). Update of Platinum Production and Addition of Platinum-Group Metals (PGMs) to GREET 2021. https://greet.anl.gov/files/pgm_2021. April 2021 memo; supporting pooled PGM model, not a published economic iridium inventory.; Anglo American Platinum Limited (2020). Annual Results 2019. https://www.valterraplatinum.com/wp-content/uploads/2026/05/annual-results-booklet-2019.pdf; Anglo American Platinum Limited (2020). Environmental, social and governance report 2019. https://www.valterraplatinum.com/wp-content/uploads/2026/05/environmental-social-and-governance-report-2019.pdf; Anglo American Platinum Limited (2021). Environmental, social and governance report 2020. https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf; Mgciniwethu Khumalo (2021). The optimal milling and mainstream flotation circuit configuration for Mogalakwena Platreef ore. https://wiredspace.wits.ac.za/server/api/core/bitstreams/20fec466-23b6-4fb5-8c0d-f494ae3351fc/content. Repository publication 2021; original signed declaration 01/11/20. North Concentrator pilot analogue.; Walter Amos Ngobeni; Antoine F. Mulaba-Bafubiandi (2024). Alkaline gelatinised locust bean gum: alternative depressant for pyroxene and talc in Platreef ore (preprint, v1). https://doi.org/10.21203/rs.3.rs-4799524/v1; Réata Colyn; Kirthi Peramaul; Tyla Smith; Lenaldi Görgens; Alta van Dyk (2023). Mogalakwena Complex: Draft Scoping Report, February 2023. https://www.altavandykenvironmental.co.za/wp-content/uploads/MM-Draft-Scoping-Report.pdf; Ivan Muñoz; Anastasia Papadopoulou; Edith Buhl; Bo P. Weidema (2026). Joint production with multiple determining products: the case of platinum-group metals. https://doi.org/10.1007/s11367-026-02665-6. Later consequential method comparison, not a source of current inventory coefficients or an erratum to GREET.; (2026). premise static economic-iridium engineering compiler. https://github.com/polca/premise/blob/850286212ca71e44ebbc0c90909640a5c5db62ae/premise/data/additional_inventories/lci-iridium-economic-proxy.xlsx	Supporting sources: Kathryn Kingsbury; Pahola Thathiana Benavides (2021). Update of Platinum Production and Addition of Platinum-Group Metals (PGMs) to GREET 2021. https://greet.anl.gov/files/pgm_2021 Anglo American Platinum Limited (2020). Annual Results 2019. https://www.valterraplatinum.com/wp-content/uploads/2026/05/annual-results-booklet-2019.pdf Anglo American Platinum Limited (2020). Environmental, social and governance report 2019. https://www.valterraplatinum.com/wp-content/uploads/2026/05/environmental-social-and-governance-report-2019.pdf Anglo American Platinum Limited (2021). Environmental, social and governance report 2020. https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf Mgciniwethu Khumalo (2021). The optimal milling and mainstream flotation circuit configuration for Mogalakwena Platreef ore. https://wiredspace.wits.ac.za/server/api/core/bitstreams/20fec466-23b6-4fb5-8c0d-f494ae3351fc/content Walter Amos Ngobeni; Antoine F. Mulaba-Bafubiandi (2024). Alkaline gelatinised locust bean gum: alternative depressant for pyroxene and talc in Platreef ore (preprint, v1). https://doi.org/10.21203/rs.3.rs-4799524/v1 Réata Colyn; Kirthi Peramaul; Tyla Smith; Lenaldi Görgens; Alta van Dyk (2023). Mogalakwena Complex: Draft Scoping Report, February 2023. https://www.altavandykenvironmental.co.za/wp-content/uploads/MM-Draft-Scoping-Report.pdf Ivan Muñoz; Anastasia Papadopoulou; Edith Buhl; Bo P. Weidema (2026). Joint production with multiple determining products: the case of platinum-group metals. https://doi.org/10.1007/s11367-026-02665-6 premise static economic-iridium engineering compiler (2026). https://github.com/polca/premise/blob/850286212ca71e44ebbc0c90909640a5c5db62ae/premise/data/additional_inventories/lci-iridium-economic-proxy.xlsx
Version metadata	Contributors, publications, projects and supporting evidence	Evidence: 1. Origin: source_import Evidence: 1. Target field: data_origins Evidence: 1. Qualification: Tags describe documented input origins of this exact supplied version. Literature does not assert direct measurements; engineering and proxy tags describe stated assumptions, not validated industrial performance. Evidence: 1. Source location: source Evidence: 1. Source reference: Existing published CLIC inventory documentation Evidence: 2. Origin: source_import Evidence: 2. Target field: data_origins Evidence: 2. Qualification: Tags describe documented input origins of this exact supplied version. Literature does not assert direct measurements; engineering and proxy tags describe stated assumptions, not validated industrial performance. Evidence: 2. Source location: description Evidence: 2. Source reference: Existing published CLIC inventory documentation Evidence: 3. Origin: source_import Evidence: 3. Target field: included_life_cycle_stages Evidence: 3. Qualification: Minimum explicitly named stage(s); no assertion that all upstream/downstream stages of the cited study are present. Manufacturing rejects alone do not create an end-of-life stage. Evidence: 3. Source location: name Evidence: 3. Source reference: Existing published CLIC inventory documentation Evidence: 4. Origin: source_import Evidence: 4. Target field: use_limitations Evidence: 4. Qualification: Version-specific capacity-share and chemistry assumptions; no versioning/approval instructions are introduced into public scientific text. Evidence: 4. Source location: description Evidence: 4. Source reference: Existing published CLIC inventory documentation Evidence: 5. Origin: source_import Evidence: 5. Target field: data_period_start_year Evidence: 5. Qualification: Period of principal company quantities only; flotation, capacity and reagent assumptions use later sources documented separately. No representative inventory year is inferred. Evidence: 5. Source location: description Evidence: 5. Source reference: Existing published CLIC inventory documentation Evidence: 6. Origin: source_import Evidence: 6. Target field: data_period_end_year Evidence: 6. Qualification: Period of principal company quantities only; not the full range of all supporting publications. Evidence: 6. Source location: description Evidence: 6. Source reference: Existing published CLIC inventory documentation Evidence: 7. Origin: source_import Evidence: 7. Target field: represents_allocated_product Evidence: 7. Qualification: Allocation of the pooled seven-product corporate operating budget; minimum iridium resource content in 8846 is direct attribution, separately qualified, not the same economic allocation. Evidence: 7. Source location: description Evidence: 7. Source reference: Existing published CLIC inventory documentation Evidence: 8. Origin: source_import Evidence: 8. Target field: multifunctionality_applicable Evidence: 8. Qualification: Allocation of the pooled seven-product corporate operating budget; minimum iridium resource content in 8846 is direct attribution, separately qualified, not the same economic allocation. Evidence: 8. Source location: description Evidence: 8. Source reference: Existing published CLIC inventory documentation Evidence: 9. Origin: source_import Evidence: 9. Target field: multifunctionality_methods Evidence: 9. Qualification: Allocation of the pooled seven-product corporate operating budget; minimum iridium resource content in 8846 is direct attribution, separately qualified, not the same economic allocation. Evidence: 9. Source location: description Evidence: 9. Source reference: Existing published CLIC inventory documentation Evidence: 10. Origin: source_import Evidence: 10. Target field: process_type Evidence: 10. Qualification: Aggregated corporate-pool mining/refining engineering proxy, not a single measured operation. Evidence: 10. Source location: inventory_snapshot/model Evidence: 10. Source reference: Existing published CLIC inventory documentation Evidence: 11. Origin: source_import Evidence: 11. Target field: system_boundary Evidence: 11. Qualification: Explicit declaration in this supplied inventory. Evidence: 11. Source location: description Evidence: 11. Source reference: Existing published CLIC inventory documentation Evidence: 12. Origin: editor_verification Evidence: 12. Target field: publications Evidence: 12. Qualification: Partial iridium-production engineering reference using original corporate 2015–2019 pooled quantities and the supporting April 2021 GREET memo by Kathryn Kingsbury and Pahola Thathiana Benavides. GREET explicitly does not implement separate market-allocation inventories for iridium/ruthenium, while permitting mass-allocated PGM surrogates. This recipe is an independent economic extension, not a published GREET iridium table or measured single factory. Corporate report covers 2019/2020 differ from release years 2020/2021; current 2026 repository upload paths do not date the underlying measurements. Khumalo's signed 2020 report has a 2021 repository publication. The 2024 preprint and 2023 planning report are later source transfers. Source authors are not CLIC inventory compilers, and publication years do not replace the principal 2015–2019 company-data period. Evidence: 12. Source location: provenance Evidence: 12. Source reference: https://greet.anl.gov/files/pgm_2021 Evidence: 13. Origin: editor_verification Evidence: 13. Target field: methodology_notes Evidence: 13. Qualification: Per kg iridium, the engineering economic factor is mean achieved Ir price 924.4 USD/troy ounce divided by 0.0311034768 kg/troy ounce and by the published 5018995769 USD annual seven-product basket. Product mass cancels in this per-kg formula; that algebra does not establish causal refining costs or a complete coproduct basket. It is a pooled average-price/average-basket scenario rather than year-by-year allocation. Chrome and other outputs are outside the inherited basket. Original annual electricity/fossil TJ series are averaged; fossil shares 2.55/3.72/0.23 are normalized over 6.5 and diesel split 96.3/3.7 percent is inherited from GREET. Literal rounded GREET tables and ounce/ton denominators have documented inconsistencies; do not rescale this reconstruction without confirming author intent and boundary. Retained historical supplier factors convert purchased fuel energy to service references, including coal 1.249925 and gas 1.052631579 MJ fuel per reference MJ. Fuel supply and direct combustion are owned once by those services; adding a second fuel or furnace process is unsupported. ZA is a geographic proxy for a corporate pool including Zimbabwe and purchased/toll-treated material. Complete upstream mining for purchased concentrate, supplier technology/reference years and actual export binding remain unresolved. Evidence: 13. Source location: energy Evidence: 13. Source reference: https://www.valterraplatinum.com/wp-content/uploads/2026/05/environmental-social-and-governance-report-2019.pdf Evidence: 14. Origin: editor_verification Evidence: 14. Target field: methodology_notes Evidence: 14. Qualification: Khumalo Table 3.2 gives North Concentrator pilot doses 273/46/130/306 g/t for SIBX/Senkol 3/Senfroth 516/Norilose 6064. The recipe applies their selected commercial-product interpretation only to North feed, inferred from the later 9.3/(9.3+4.2) Mtpa capacity ratio. Mean combined Mogalakwena feed is 13.091 million t/year; actual 2015–2019 North throughput is not measured by that 2023 planning ratio, and offsite Baobab treatment is documented. The 2024 preprint supports selected active fractions 95/40/100/60 percent but its SIBX text 95 percent conflicts with Table 1 93.5 percent. Both purity and commercial-versus-active dose basis remain scenarios. Sodium ethyl xanthate is a different alkyl-chain proxy for SIBX; a generic organophosphorus average is not actual dithiophosphate chemistry; short-chain polyether polyols are not a verified PPG 400 frother formulation; pure CMC excludes commercial carriers. Unmodelled commercial carrier/impurity mass and reagent environmental fate are not zero. No other-company ore recipe, waste treatment, dissolved release, toxicity equivalence or recovery credit is established by these manufacturing proxies. Evidence: 14. Source location: flotation Evidence: 14. Source reference: https://wiredspace.wits.ac.za/server/api/core/bitstreams/20fec466-23b6-4fb5-8c0d-f494ae3351fc/content Evidence: 15. Origin: editor_verification Evidence: 15. Target field: methodology_notes Evidence: 15. Qualification: The 2020 ESG report printed 70 supplies previously missing 2019 SO2 at 21.97 kt; the existing foreground residual already uses the five-year 20.534 kt mean. Allocated target 121.592762938 kg/kg Ir less inherited direct utility SO2 11.381825897 gives current 110.210937042 kg. Subtract direct utility emissions once, not upstream supplier emissions; this assumes the corporate total includes utility combustion and uses historical provider evidence. Later 2019 total water withdrawal 25094 ML differs from 25894 ML in the 2019 report, but the separately used potable series 7642/6142/9433/12327/14408 ML is unchanged. Its allocated 59158.485383 kg less historical embedded softened water 165.078346 kg gives current 58993.407037 kg tap water. Boiler feed belonging to this potable budget remains an assumption; this is not complete withdrawal, return or net-consumption accounting. Corporate NOx has missing 2015 data and incompatible known-year/utility boundaries; do not turn missing values into zero or add a negative balancing emission. Published version 1.0.1 already contains 1 kg direct Ir-resource lower bound for 1 kg contained-metal output. It is not economically scaled extraction, observed purity, ore grade or 100 percent recovery. Historical 1.0.0 lacks that row; do not apply the resource addition again to the current version. Mining/refining losses, final-refinery chemicals, land and complete waste treatment remain unresolved. Evidence: 15. Source location: water_resource Evidence: 15. Source reference: https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf Evidence: 16. Origin: editor_verification Evidence: 16. Target field: publications Evidence: 16. Qualification: Verify Argonne, University of the Witwatersrand, University of Johannesburg, Aalborg and Danish Topsoe identities against exact country/identifier records. Wits and UJ are distinct universities. The GREET byline's Systems Assessment Group/Energy Systems Division are Argonne units; its SULI training programme, DOE Office of Science and workforce-development office are related programme/agency roles, not duplicate institutions or verified grants for CLIC. Khumalo acknowledges Mogalakwena management funding and Anglo Research technical support; supervisor and technicians are not coauthors. Preserve historical Anglo American Platinum issuer, operating-client Rustenburg Platinum Mines and current Valterra repository-host roles without automatic legal merger. AECI/Senmin supplier branding, AvD consultant/preparer and mining-client roles are distinct. New 2026 main-paper department and supplementary DCEA are related Aalborg units. The article identifies Aalborg open-access support; generic Crossmark funding must not broaden that to verified inventory-research or CLIC funding. Keep CLIC authors, contributors, institutions, projects and funding arrays unchanged. Evidence: 16. Source location: entities Evidence: 16. Source reference: https://greet.anl.gov/files/pgm_2021 Evidence: 17. Origin: editor_verification Evidence: 17. Target field: publications Evidence: 17. Qualification: The later corporate report adds missing SO2 and changes total water withdrawal, while no new correction to the separately used potable series is established. This source update is reflected in the SO2 target; a formal erratum was not independently identified. Original preprint version 1 is posted 22 August 2024; fresh page state lists no version of record, associated publication or amendment, which does not prove a complete amendment history. The same authors' cassia-tora/locust-bean paper is a different study. Exact DOI Crossmark reports the 2026 Muñoz/Papadopoulou/Buhl/Weidema paper current, but complete supplementary history remains unproven. Its SI sections 3.8/4.8 reconstruct a refining-only consequential response using older refinery data and avoided residue disposal; Table SM 18 combines 0.624 ZA refining response and 0.376 reduced consumption per kg Ir. Those boundary, substitution and fuel assumptions do not correct or replace this attributional corporate-pool recipe. Current PEM stack 4856 buys 0.8 kg Ir, as in the pinned native caller, but has 3.9 declarations versus this 3.12 provider; actual migration/binding, loading, purity, stack life and recovery remain unverified. No extra lifetime multiplier, disposal credit or current amount correction is established. Static arithmetic agreement is not full inventory or scientific sign-off. Evidence: 17. Source location: updates Evidence: 17. Source reference: https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf Publications: 1. Doi: Not set Publications: 1. Url: https://greet.anl.gov/files/pgm_2021 Publications: 1. Title: Update of Platinum Production and Addition of Platinum-Group Metals (PGMs) to GREET 2021 Publications: 1. Scientific authors: 1. Name: Kathryn Kingsbury Publications: 1. Scientific authors: 1. Orcid: Not set Publications: 1. Scientific authors: 1. Affiliations: 1. Ror: https://ror.org/05gvnxz63 Publications: 1. Scientific authors: 1. Affiliations: 1. Url: Not set Publications: 1. Scientific authors: 1. Affiliations: 1. Name: Argonne National Laboratory Publications: 1. Scientific authors: 2. Name: Pahola Thathiana Benavides Publications: 1. Scientific authors: 2. Orcid: Not set Publications: 1. Scientific authors: 2. Affiliations: 1. Ror: https://ror.org/05gvnxz63 Publications: 1. Scientific authors: 2. Affiliations: 1. Url: Not set Publications: 1. Scientific authors: 2. Affiliations: 1. Name: Argonne National Laboratory Publications: 1. Citation: Kathryn Kingsbury; Pahola Thathiana Benavides (2021). Update of Platinum Production and Addition of Platinum-Group Metals (PGMs) to GREET 2021. https://greet.anl.gov/files/pgm_2021. April 2021 memo; supporting pooled PGM model, not a published economic iridium inventory. Publications: 1. Relation: supporting_source Publications: 1. Source type: technical_report Publications: 1. Publication year: 2021 Publications: 2. Doi: Not set Publications: 2. Url: https://www.valterraplatinum.com/wp-content/uploads/2026/05/annual-results-booklet-2019.pdf Publications: 2. Title: Annual Results 2019 Publications: 2. Scientific authors: 1. Name: Anglo American Platinum Limited Publications: 2. Scientific authors: 1. Orcid: Not set Publications: 2. Citation: Anglo American Platinum Limited (2020). Annual Results 2019. https://www.valterraplatinum.com/wp-content/uploads/2026/05/annual-results-booklet-2019.pdf Publications: 2. Relation: supporting_source Publications: 2. Source type: industry_documentation Publications: 2. Publication year: 2020 Publications: 3. Doi: Not set Publications: 3. Url: https://www.valterraplatinum.com/wp-content/uploads/2026/05/environmental-social-and-governance-report-2019.pdf Publications: 3. Title: Environmental, social and governance report 2019 Publications: 3. Scientific authors: 1. Name: Anglo American Platinum Limited Publications: 3. Scientific authors: 1. Orcid: Not set Publications: 3. Citation: Anglo American Platinum Limited (2020). Environmental, social and governance report 2019. https://www.valterraplatinum.com/wp-content/uploads/2026/05/environmental-social-and-governance-report-2019.pdf Publications: 3. Relation: supporting_source Publications: 3. Source type: industry_documentation Publications: 3. Publication year: 2020 Publications: 4. Doi: Not set Publications: 4. Url: https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf Publications: 4. Title: Environmental, social and governance report 2020 Publications: 4. Scientific authors: 1. Name: Anglo American Platinum Limited Publications: 4. Scientific authors: 1. Orcid: Not set Publications: 4. Citation: Anglo American Platinum Limited (2021). Environmental, social and governance report 2020. https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf Publications: 4. Relation: supporting_source Publications: 4. Source type: industry_documentation Publications: 4. Publication year: 2021 Publications: 5. Doi: Not set Publications: 5. Url: https://wiredspace.wits.ac.za/server/api/core/bitstreams/20fec466-23b6-4fb5-8c0d-f494ae3351fc/content Publications: 5. Title: The optimal milling and mainstream flotation circuit configuration for Mogalakwena Platreef ore Publications: 5. Scientific authors: 1. Name: Mgciniwethu Khumalo Publications: 5. Scientific authors: 1. Orcid: Not set Publications: 5. Scientific authors: 1. Affiliations: 1. Ror: https://ror.org/03rp50x72 Publications: 5. Scientific authors: 1. Affiliations: 1. Url: Not set Publications: 5. Scientific authors: 1. Affiliations: 1. Name: University of the Witwatersrand Publications: 5. Citation: Mgciniwethu Khumalo (2021). The optimal milling and mainstream flotation circuit configuration for Mogalakwena Platreef ore. https://wiredspace.wits.ac.za/server/api/core/bitstreams/20fec466-23b6-4fb5-8c0d-f494ae3351fc/content. Repository publication 2021; original signed declaration 01/11/20. North Concentrator pilot analogue. Publications: 5. Relation: supporting_source Publications: 5. Source type: technical_report Publications: 5. Publication year: 2021 Publications: 6. Doi: 10.21203/rs.3.rs-4799524/v1 Publications: 6. Url: https://doi.org/10.21203/rs.3.rs-4799524/v1 Publications: 6. Title: Alkaline gelatinised locust bean gum: alternative depressant for pyroxene and talc in Platreef ore (preprint, v1) Publications: 6. Scientific authors: 1. Name: Walter Amos Ngobeni Publications: 6. Scientific authors: 1. Orcid: Not set Publications: 6. Scientific authors: 1. Affiliations: 1. Ror: Not set Publications: 6. Scientific authors: 1. Affiliations: 1. Url: Not set Publications: 6. Scientific authors: 1. Affiliations: 1. Name: AECI Mining Chemicals Publications: 6. Scientific authors: 2. Name: Antoine F. Mulaba-Bafubiandi Publications: 6. Scientific authors: 2. Orcid: Not set Publications: 6. Scientific authors: 2. Affiliations: 1. Ror: https://ror.org/04z6c2n17 Publications: 6. Scientific authors: 2. Affiliations: 1. Url: Not set Publications: 6. Scientific authors: 2. Affiliations: 1. Name: University of Johannesburg Publications: 6. Citation: Walter Amos Ngobeni; Antoine F. Mulaba-Bafubiandi (2024). Alkaline gelatinised locust bean gum: alternative depressant for pyroxene and talc in Platreef ore (preprint, v1). https://doi.org/10.21203/rs.3.rs-4799524/v1 Publications: 6. Relation: supporting_source Publications: 6. Source type: unpublished_research Publications: 6. Publication year: 2024 Publications: 7. Doi: Not set Publications: 7. Url: https://www.altavandykenvironmental.co.za/wp-content/uploads/MM-Draft-Scoping-Report.pdf Publications: 7. Title: Mogalakwena Complex: Draft Scoping Report, February 2023 Publications: 7. Scientific authors: 1. Name: Réata Colyn Publications: 7. Scientific authors: 1. Orcid: Not set Publications: 7. Scientific authors: 1. Affiliations: 1. Ror: Not set Publications: 7. Scientific authors: 1. Affiliations: 1. Url: Not set Publications: 7. Scientific authors: 1. Affiliations: 1. Name: Alta van Dyk Environmental Consultants cc Publications: 7. Scientific authors: 2. Name: Kirthi Peramaul Publications: 7. Scientific authors: 2. Orcid: Not set Publications: 7. Scientific authors: 2. Affiliations: 1. Ror: Not set Publications: 7. Scientific authors: 2. Affiliations: 1. Url: Not set Publications: 7. Scientific authors: 2. Affiliations: 1. Name: Alta van Dyk Environmental Consultants cc Publications: 7. Scientific authors: 3. Name: Tyla Smith Publications: 7. Scientific authors: 3. Orcid: Not set Publications: 7. Scientific authors: 3. Affiliations: 1. Ror: Not set Publications: 7. Scientific authors: 3. Affiliations: 1. Url: Not set Publications: 7. Scientific authors: 3. Affiliations: 1. Name: Alta van Dyk Environmental Consultants cc Publications: 7. Scientific authors: 4. Name: Lenaldi Görgens Publications: 7. Scientific authors: 4. Orcid: Not set Publications: 7. Scientific authors: 4. Affiliations: 1. Ror: Not set Publications: 7. Scientific authors: 4. Affiliations: 1. Url: Not set Publications: 7. Scientific authors: 4. Affiliations: 1. Name: Alta van Dyk Environmental Consultants cc Publications: 7. Scientific authors: 5. Name: Alta van Dyk Publications: 7. Scientific authors: 5. Orcid: Not set Publications: 7. Scientific authors: 5. Affiliations: 1. Ror: Not set Publications: 7. Scientific authors: 5. Affiliations: 1. Url: Not set Publications: 7. Scientific authors: 5. Affiliations: 1. Name: Alta van Dyk Environmental Consultants cc Publications: 7. Citation: Réata Colyn; Kirthi Peramaul; Tyla Smith; Lenaldi Görgens; Alta van Dyk (2023). Mogalakwena Complex: Draft Scoping Report, February 2023. https://www.altavandykenvironmental.co.za/wp-content/uploads/MM-Draft-Scoping-Report.pdf Publications: 7. Relation: supporting_source Publications: 7. Source type: technical_report Publications: 7. Publication year: 2023 Publications: 8. Doi: 10.1007/s11367-026-02665-6 Publications: 8. Url: https://doi.org/10.1007/s11367-026-02665-6 Publications: 8. Title: Joint production with multiple determining products: the case of platinum-group metals Publications: 8. Scientific authors: 1. Name: Ivan Muñoz Publications: 8. Scientific authors: 1. Orcid: Not set Publications: 8. Scientific authors: 1. Affiliations: 1. Ror: Not set Publications: 8. Scientific authors: 1. Affiliations: 1. Url: Not set Publications: 8. Scientific authors: 1. Affiliations: 1. Name: 2.-0 LCA consultants Publications: 8. Scientific authors: 2. Name: Anastasia Papadopoulou Publications: 8. Scientific authors: 2. Orcid: Not set Publications: 8. Scientific authors: 2. Affiliations: 1. Ror: https://ror.org/03c6k9p96 Publications: 8. Scientific authors: 2. Affiliations: 1. Url: Not set Publications: 8. Scientific authors: 2. Affiliations: 1. Name: Haldor Topsoe (Denmark) Publications: 8. Scientific authors: 3. Name: Edith Buhl Publications: 8. Scientific authors: 3. Orcid: Not set Publications: 8. Scientific authors: 3. Affiliations: 1. Ror: https://ror.org/03c6k9p96 Publications: 8. Scientific authors: 3. Affiliations: 1. Url: Not set Publications: 8. Scientific authors: 3. Affiliations: 1. Name: Haldor Topsoe (Denmark) Publications: 8. Scientific authors: 4. Name: Bo P. Weidema Publications: 8. Scientific authors: 4. Orcid: 0000-0003-1863-6528 Publications: 8. Scientific authors: 4. Affiliations: 1. Ror: https://ror.org/04m5j1k67 Publications: 8. Scientific authors: 4. Affiliations: 1. Url: Not set Publications: 8. Scientific authors: 4. Affiliations: 1. Name: Aalborg University Publications: 8. Citation: Ivan Muñoz; Anastasia Papadopoulou; Edith Buhl; Bo P. Weidema (2026). Joint production with multiple determining products: the case of platinum-group metals. https://doi.org/10.1007/s11367-026-02665-6. Later consequential method comparison, not a source of current inventory coefficients or an erratum to GREET. Publications: 8. Relation: supporting_source Publications: 8. Source type: scientific_journal Publications: 8. Publication year: 2026 Publications: 9. Doi: Not set Publications: 9. Url: https://github.com/polca/premise/blob/850286212ca71e44ebbc0c90909640a5c5db62ae/premise/data/additional_inventories/lci-iridium-economic-proxy.xlsx Publications: 9. Title: premise static economic-iridium engineering compiler Publications: 9. Citation: (2026). premise static economic-iridium engineering compiler. https://github.com/polca/premise/blob/850286212ca71e44ebbc0c90909640a5c5db62ae/premise/data/additional_inventories/lci-iridium-economic-proxy.xlsx Publications: 9. Relation: supporting_source Publications: 9. Source type: data_repository Publications: 9. Publication year: 2026	Evidence: 1. Origin: source_import Evidence: 1. Target field: data_origins Evidence: 1. Qualification: Tags describe documented input origins of this exact supplied version. Literature does not assert direct measurements; engineering and proxy tags describe stated assumptions, not validated industrial performance. Evidence: 1. Source location: source Evidence: 1. Source reference: Existing published CLIC inventory documentation Evidence: 2. Origin: source_import Evidence: 2. Target field: data_origins Evidence: 2. Qualification: Tags describe documented input origins of this exact supplied version. Literature does not assert direct measurements; engineering and proxy tags describe stated assumptions, not validated industrial performance. Evidence: 2. Source location: description Evidence: 2. Source reference: Existing published CLIC inventory documentation Evidence: 3. Origin: source_import Evidence: 3. Target field: included_life_cycle_stages Evidence: 3. Qualification: Minimum explicitly named stage(s); no assertion that all upstream/downstream stages of the cited study are present. Manufacturing rejects alone do not create an end-of-life stage. Evidence: 3. Source location: name Evidence: 3. Source reference: Existing published CLIC inventory documentation Evidence: 4. Origin: source_import Evidence: 4. Target field: use_limitations Evidence: 4. Qualification: Copied version-specific scientific qualification; it remains applicable to this exact reconstruction and is not a claim about the source paper. Evidence: 4. Source location: description Evidence: 4. Source reference: Existing published CLIC inventory documentation Evidence: 5. Origin: source_import Evidence: 5. Target field: data_period_start_year Evidence: 5. Qualification: Period of principal company quantities only; flotation, capacity and reagent assumptions use later sources documented separately. No representative inventory year is inferred. Evidence: 5. Source location: description Evidence: 5. Source reference: Existing published CLIC inventory documentation Evidence: 6. Origin: source_import Evidence: 6. Target field: data_period_end_year Evidence: 6. Qualification: Period of principal company quantities only; not the full range of all supporting publications. Evidence: 6. Source location: description Evidence: 6. Source reference: Existing published CLIC inventory documentation Evidence: 7. Origin: source_import Evidence: 7. Target field: represents_allocated_product Evidence: 7. Qualification: Allocation of the pooled seven-product corporate operating budget; minimum iridium resource content in 8846 is direct attribution, separately qualified, not the same economic allocation. Evidence: 7. Source location: description Evidence: 7. Source reference: Existing published CLIC inventory documentation Evidence: 8. Origin: source_import Evidence: 8. Target field: multifunctionality_applicable Evidence: 8. Qualification: Allocation of the pooled seven-product corporate operating budget; minimum iridium resource content in 8846 is direct attribution, separately qualified, not the same economic allocation. Evidence: 8. Source location: description Evidence: 8. Source reference: Existing published CLIC inventory documentation Evidence: 9. Origin: source_import Evidence: 9. Target field: multifunctionality_methods Evidence: 9. Qualification: Allocation of the pooled seven-product corporate operating budget; minimum iridium resource content in 8846 is direct attribution, separately qualified, not the same economic allocation. Evidence: 9. Source location: description Evidence: 9. Source reference: Existing published CLIC inventory documentation Evidence: 10. Origin: source_import Evidence: 10. Target field: process_type Evidence: 10. Qualification: Aggregated corporate-pool mining/refining engineering proxy, not a single measured operation. Evidence: 10. Source location: inventory_snapshot/model Evidence: 10. Source reference: Existing published CLIC inventory documentation Evidence: 11. Origin: source_import Evidence: 11. Target field: system_boundary Evidence: 11. Qualification: Explicit declaration in this supplied inventory. Evidence: 11. Source location: description Evidence: 11. Source reference: Existing published CLIC inventory documentation Evidence: 12. Origin: editor_verification Evidence: 12. Target field: publications Evidence: 12. Qualification: Partial iridium-production engineering reference using original corporate 2015–2019 pooled quantities and the supporting April 2021 GREET memo by Kathryn Kingsbury and Pahola Thathiana Benavides. GREET explicitly does not implement separate market-allocation inventories for iridium/ruthenium, while permitting mass-allocated PGM surrogates. This recipe is an independent economic extension, not a published GREET iridium table or measured single factory. Corporate report covers 2019/2020 differ from release years 2020/2021; current 2026 repository upload paths do not date the underlying measurements. Khumalo's signed 2020 report has a 2021 repository publication. The 2024 preprint and 2023 planning report are later source transfers. Source authors are not CLIC inventory compilers, and publication years do not replace the principal 2015–2019 company-data period. Evidence: 12. Source location: provenance Evidence: 12. Source reference: https://greet.anl.gov/files/pgm_2021 Evidence: 13. Origin: editor_verification Evidence: 13. Target field: methodology_notes Evidence: 13. Qualification: Per kg iridium, the engineering economic factor is mean achieved Ir price 924.4 USD/troy ounce divided by 0.0311034768 kg/troy ounce and by the published 5018995769 USD annual seven-product basket. Product mass cancels in this per-kg formula; that algebra does not establish causal refining costs or a complete coproduct basket. It is a pooled average-price/average-basket scenario rather than year-by-year allocation. Chrome and other outputs are outside the inherited basket. Original annual electricity/fossil TJ series are averaged; fossil shares 2.55/3.72/0.23 are normalized over 6.5 and diesel split 96.3/3.7 percent is inherited from GREET. Literal rounded GREET tables and ounce/ton denominators have documented inconsistencies; do not rescale this reconstruction without confirming author intent and boundary. Retained historical supplier factors convert purchased fuel energy to service references, including coal 1.249925 and gas 1.052631579 MJ fuel per reference MJ. Fuel supply and direct combustion are owned once by those services; adding a second fuel or furnace process is unsupported. ZA is a geographic proxy for a corporate pool including Zimbabwe and purchased/toll-treated material. Complete upstream mining for purchased concentrate, supplier technology/reference years and actual export binding remain unresolved. Evidence: 13. Source location: energy Evidence: 13. Source reference: https://www.valterraplatinum.com/wp-content/uploads/2026/05/environmental-social-and-governance-report-2019.pdf Evidence: 14. Origin: editor_verification Evidence: 14. Target field: methodology_notes Evidence: 14. Qualification: Khumalo Table 3.2 gives North Concentrator pilot doses 273/46/130/306 g/t for SIBX/Senkol 3/Senfroth 516/Norilose 6064. The recipe applies their selected commercial-product interpretation only to North feed, inferred from the later 9.3/(9.3+4.2) Mtpa capacity ratio. Mean combined Mogalakwena feed is 13.091 million t/year; actual 2015–2019 North throughput is not measured by that 2023 planning ratio, and offsite Baobab treatment is documented. The 2024 preprint supports selected active fractions 95/40/100/60 percent but its SIBX text 95 percent conflicts with Table 1 93.5 percent. Both purity and commercial-versus-active dose basis remain scenarios. Sodium ethyl xanthate is a different alkyl-chain proxy for SIBX; a generic organophosphorus average is not actual dithiophosphate chemistry; short-chain polyether polyols are not a verified PPG 400 frother formulation; pure CMC excludes commercial carriers. Unmodelled commercial carrier/impurity mass and reagent environmental fate are not zero. No other-company ore recipe, waste treatment, dissolved release, toxicity equivalence or recovery credit is established by these manufacturing proxies. Evidence: 14. Source location: flotation Evidence: 14. Source reference: https://wiredspace.wits.ac.za/server/api/core/bitstreams/20fec466-23b6-4fb5-8c0d-f494ae3351fc/content Evidence: 15. Origin: editor_verification Evidence: 15. Target field: methodology_notes Evidence: 15. Qualification: The 2020 ESG report printed 70 supplies previously missing 2019 SO2 at 21.97 kt; the existing foreground residual already uses the five-year 20.534 kt mean. Allocated target 121.592762938 kg/kg Ir less inherited direct utility SO2 11.381825897 gives current 110.210937042 kg. Subtract direct utility emissions once, not upstream supplier emissions; this assumes the corporate total includes utility combustion and uses historical provider evidence. Later 2019 total water withdrawal 25094 ML differs from 25894 ML in the 2019 report, but the separately used potable series 7642/6142/9433/12327/14408 ML is unchanged. Its allocated 59158.485383 kg less historical embedded softened water 165.078346 kg gives current 58993.407037 kg tap water. Boiler feed belonging to this potable budget remains an assumption; this is not complete withdrawal, return or net-consumption accounting. Corporate NOx has missing 2015 data and incompatible known-year/utility boundaries; do not turn missing values into zero or add a negative balancing emission. Published version 1.0.1 already contains 1 kg direct Ir-resource lower bound for 1 kg contained-metal output. It is not economically scaled extraction, observed purity, ore grade or 100 percent recovery. Historical 1.0.0 lacks that row; do not apply the resource addition again to the current version. Mining/refining losses, final-refinery chemicals, land and complete waste treatment remain unresolved. Evidence: 15. Source location: water_resource Evidence: 15. Source reference: https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf Evidence: 16. Origin: editor_verification Evidence: 16. Target field: publications Evidence: 16. Qualification: Verify Argonne, University of the Witwatersrand, University of Johannesburg, Aalborg and Danish Topsoe identities against exact country/identifier records. Wits and UJ are distinct universities. The GREET byline's Systems Assessment Group/Energy Systems Division are Argonne units; its SULI training programme, DOE Office of Science and workforce-development office are related programme/agency roles, not duplicate institutions or verified grants for CLIC. Khumalo acknowledges Mogalakwena management funding and Anglo Research technical support; supervisor and technicians are not coauthors. Preserve historical Anglo American Platinum issuer, operating-client Rustenburg Platinum Mines and current Valterra repository-host roles without automatic legal merger. AECI/Senmin supplier branding, AvD consultant/preparer and mining-client roles are distinct. New 2026 main-paper department and supplementary DCEA are related Aalborg units. The article identifies Aalborg open-access support; generic Crossmark funding must not broaden that to verified inventory-research or CLIC funding. Keep CLIC authors, contributors, institutions, projects and funding arrays unchanged. Evidence: 16. Source location: entities Evidence: 16. Source reference: https://greet.anl.gov/files/pgm_2021 Evidence: 17. Origin: editor_verification Evidence: 17. Target field: publications Evidence: 17. Qualification: The later corporate report adds missing SO2 and changes total water withdrawal, while no new correction to the separately used potable series is established. This source update is reflected in the SO2 target; a formal erratum was not independently identified. Original preprint version 1 is posted 22 August 2024; fresh page state lists no version of record, associated publication or amendment, which does not prove a complete amendment history. The same authors' cassia-tora/locust-bean paper is a different study. Exact DOI Crossmark reports the 2026 Muñoz/Papadopoulou/Buhl/Weidema paper current, but complete supplementary history remains unproven. Its SI sections 3.8/4.8 reconstruct a refining-only consequential response using older refinery data and avoided residue disposal; Table SM 18 combines 0.624 ZA refining response and 0.376 reduced consumption per kg Ir. Those boundary, substitution and fuel assumptions do not correct or replace this attributional corporate-pool recipe. Current PEM stack 4856 buys 0.8 kg Ir, as in the pinned native caller, but has 3.9 declarations versus this 3.12 provider; actual migration/binding, loading, purity, stack life and recovery remain unverified. No extra lifetime multiplier, disposal credit or current amount correction is established. Static arithmetic agreement is not full inventory or scientific sign-off. Evidence: 17. Source location: updates Evidence: 17. Source reference: https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf Evidence: 18. Origin: editor_verification Evidence: 18. Target field: technology_description Evidence: 18. Qualification: Technical-characterisation review TC-3654. Design capacity: Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan. Evidence: 18. Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review Evidence: 18. Source reference: https://zenodo.org/records/23935622 Evidence: 19. Origin: editor_verification Evidence: 19. Target field: technology_description Evidence: 19. Qualification: Technical-characterisation review TC-3654. Design capacity unit: Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan. Evidence: 19. Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review Evidence: 19. Source reference: https://zenodo.org/records/23935622 Evidence: 20. Origin: editor_verification Evidence: 20. Target field: technology_description Evidence: 20. Qualification: Technical-characterisation review TC-3654. Capacity factor (%): Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan. Evidence: 20. Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review Evidence: 20. Source reference: https://zenodo.org/records/23935622 Evidence: 21. Origin: editor_verification Evidence: 21. Target field: technology_description Evidence: 21. Qualification: Technical-characterisation review TC-3654. Annual production volume: Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan. Evidence: 21. Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review Evidence: 21. Source reference: https://zenodo.org/records/23935622 Evidence: 22. Origin: editor_verification Evidence: 22. Target field: technology_description Evidence: 22. Qualification: Technical-characterisation review TC-3654. Annual production volume unit: Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan. Evidence: 22. Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review Evidence: 22. Source reference: https://zenodo.org/records/23935622 Evidence: 23. Origin: editor_verification Evidence: 23. Target field: technology_description Evidence: 23. Qualification: Technical-characterisation review TC-3654. Annual production volume year: Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan. Evidence: 23. Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review Evidence: 23. Source reference: https://zenodo.org/records/23935622 Evidence: 24. Origin: editor_verification Evidence: 24. Target field: technology_description Evidence: 24. Qualification: Technical-characterisation review TC-3654. Plant or represented-asset lifetime (years): Unspecified. Basis: Own one-kg economically allocated metal supply is a pooled reference rather than a configured iridium plant. Corporate annual inputs and combined ore feed, later concentrator planning capacities, prices and reagent activity do not establish own iridium output capacity, annual production, capacity factor or calendar lifetime. Retain all own numeric fields unspecified. Reagent/metal recovery, assay, retention, abatement and specific utility inputs are not capacity factor. Source trial size, corporate feed/plan totals, per-area allocation and vessel lifetime throughput do not identify own configured capacity, annual production or calendar equipment life. Do not infer operating year from publication or compiler date. Evidence classification: source parameter and exact reference scope review. Confidence: high for scoped source model values and explicit gaps. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan. Evidence: 24. Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review Evidence: 24. Source reference: https://zenodo.org/records/23935622 Evidence: 25. Origin: editor_verification Evidence: 25. Target field: technology_description Evidence: 25. Qualification: Technical-characterisation review TC-3654. Commercial maturity stage: Unspecified. Basis: Leave exact commercial maturity and numerical TRL unspecified. Ideal chemistry, experimental assays, source industrial ancestry or conventional constituents alone do not establish deployment of this complete mixed engineering recipe or a source-assigned exact readiness level. Evidence classification: source scope and explicit curator assessment. Confidence: medium curator judgement. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan. Evidence: 25. Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review Evidence: 25. Source reference: https://zenodo.org/records/23935622 Evidence: 26. Origin: editor_verification Evidence: 26. Target field: technology_description Evidence: 26. Qualification: Technical-characterisation review TC-3654. Technology readiness level: Unspecified. Basis: Leave exact commercial maturity and numerical TRL unspecified. Ideal chemistry, experimental assays, source industrial ancestry or conventional constituents alone do not establish deployment of this complete mixed engineering recipe or a source-assigned exact readiness level. Evidence classification: source scope and explicit curator assessment. Confidence: medium curator judgement. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan. Evidence: 26. Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review Evidence: 26. Source reference: https://zenodo.org/records/23935622 Evidence: 27. Origin: editor_verification Evidence: 27. Target field: technology_description Evidence: 27. Qualification: Technical-characterisation review TC-3654. Technological representativeness: 5. Basis: Curator technology/geography/time 5/4/4 for idealized, reconstructed or transferred process scope and supplier/observation limitations. Preserve worse prior ratings. Mixed source dates, specimen tests and reports do not establish a measured whole-inventory period; corporate-pool geography is not a single South-African installation. Evidence classification: source scope and explicit curator assessment. Confidence: medium curator judgement. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan. Evidence: 27. Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review Evidence: 27. Source reference: https://zenodo.org/records/23935622 Evidence: 28. Origin: editor_verification Evidence: 28. Target field: technology_description Evidence: 28. Qualification: Technical-characterisation review TC-3654. Geographical representativeness: 4. Basis: Curator technology/geography/time 5/4/4 for idealized, reconstructed or transferred process scope and supplier/observation limitations. Preserve worse prior ratings. Mixed source dates, specimen tests and reports do not establish a measured whole-inventory period; corporate-pool geography is not a single South-African installation. Evidence classification: source scope and explicit curator assessment. Confidence: medium curator judgement. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan. Evidence: 28. Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review Evidence: 28. Source reference: https://zenodo.org/records/23935622 Evidence: 29. Origin: editor_verification Evidence: 29. Target field: technology_description Evidence: 29. Qualification: Technical-characterisation review TC-3654. Temporal representativeness: 4. Basis: Curator technology/geography/time 5/4/4 for idealized, reconstructed or transferred process scope and supplier/observation limitations. Preserve worse prior ratings. Mixed source dates, specimen tests and reports do not establish a measured whole-inventory period; corporate-pool geography is not a single South-African installation. Evidence classification: source scope and explicit curator assessment. Confidence: medium curator judgement. A retained model value is not a measured observation or industrial certification. Source-specific assumptions and detailed technical parameters accompany this plan. Evidence: 29. Source location: Guarded current inventory and original-source/assay/trial context in prior editorial and technical review Evidence: 29. Source reference: https://zenodo.org/records/23935622 Publications: 1. Doi: Not set Publications: 1. Url: https://greet.anl.gov/files/pgm_2021 Publications: 1. Title: Update of Platinum Production and Addition of Platinum-Group Metals (PGMs) to GREET 2021 Publications: 1. Scientific authors: 1. Name: Kathryn Kingsbury Publications: 1. Scientific authors: 1. Orcid: Not set Publications: 1. Scientific authors: 1. Affiliations: 1. Ror: https://ror.org/05gvnxz63 Publications: 1. Scientific authors: 1. Affiliations: 1. Url: Not set Publications: 1. Scientific authors: 1. Affiliations: 1. Name: Argonne National Laboratory Publications: 1. Scientific authors: 2. Name: Pahola Thathiana Benavides Publications: 1. Scientific authors: 2. Orcid: Not set Publications: 1. Scientific authors: 2. Affiliations: 1. Ror: https://ror.org/05gvnxz63 Publications: 1. Scientific authors: 2. Affiliations: 1. Url: Not set Publications: 1. Scientific authors: 2. Affiliations: 1. Name: Argonne National Laboratory Publications: 1. Citation: Kathryn Kingsbury; Pahola Thathiana Benavides (2021). Update of Platinum Production and Addition of Platinum-Group Metals (PGMs) to GREET 2021. https://greet.anl.gov/files/pgm_2021 Publications: 1. Relation: supporting_source Publications: 1. Source type: technical_report Publications: 1. Publication year: 2021 Publications: 2. Doi: Not set Publications: 2. Url: https://www.valterraplatinum.com/wp-content/uploads/2026/05/annual-results-booklet-2019.pdf Publications: 2. Title: Annual Results 2019 Publications: 2. Scientific authors: 1. Name: Anglo American Platinum Limited Publications: 2. Scientific authors: 1. Orcid: Not set Publications: 2. Citation: Anglo American Platinum Limited (2020). Annual Results 2019. https://www.valterraplatinum.com/wp-content/uploads/2026/05/annual-results-booklet-2019.pdf Publications: 2. Relation: supporting_source Publications: 2. Source type: industry_documentation Publications: 2. Publication year: 2020 Publications: 3. Doi: Not set Publications: 3. Url: https://www.valterraplatinum.com/wp-content/uploads/2026/05/environmental-social-and-governance-report-2019.pdf Publications: 3. Title: Environmental, social and governance report 2019 Publications: 3. Scientific authors: 1. Name: Anglo American Platinum Limited Publications: 3. Scientific authors: 1. Orcid: Not set Publications: 3. Citation: Anglo American Platinum Limited (2020). Environmental, social and governance report 2019. https://www.valterraplatinum.com/wp-content/uploads/2026/05/environmental-social-and-governance-report-2019.pdf Publications: 3. Relation: supporting_source Publications: 3. Source type: industry_documentation Publications: 3. Publication year: 2020 Publications: 4. Doi: Not set Publications: 4. Url: https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf Publications: 4. Title: Environmental, social and governance report 2020 Publications: 4. Scientific authors: 1. Name: Anglo American Platinum Limited Publications: 4. Scientific authors: 1. Orcid: Not set Publications: 4. Citation: Anglo American Platinum Limited (2021). Environmental, social and governance report 2020. https://www.valterraplatinum.com/wp-content/uploads/2026/05/aap-esg-report-2020.pdf Publications: 4. Relation: supporting_source Publications: 4. Source type: industry_documentation Publications: 4. Publication year: 2021 Publications: 5. Doi: Not set Publications: 5. Url: https://wiredspace.wits.ac.za/server/api/core/bitstreams/20fec466-23b6-4fb5-8c0d-f494ae3351fc/content Publications: 5. Title: The optimal milling and mainstream flotation circuit configuration for Mogalakwena Platreef ore Publications: 5. Scientific authors: 1. Name: Mgciniwethu Khumalo Publications: 5. Scientific authors: 1. Orcid: Not set Publications: 5. Scientific authors: 1. Affiliations: 1. Ror: https://ror.org/03rp50x72 Publications: 5. Scientific authors: 1. Affiliations: 1. Url: Not set Publications: 5. Scientific authors: 1. Affiliations: 1. Name: University of the Witwatersrand Publications: 5. Citation: Mgciniwethu Khumalo (2021). The optimal milling and mainstream flotation circuit configuration for Mogalakwena Platreef ore. https://wiredspace.wits.ac.za/server/api/core/bitstreams/20fec466-23b6-4fb5-8c0d-f494ae3351fc/content Publications: 5. Relation: supporting_source Publications: 5. Source type: technical_report Publications: 5. Publication year: 2021 Publications: 6. Doi: 10.21203/rs.3.rs-4799524/v1 Publications: 6. Url: https://doi.org/10.21203/rs.3.rs-4799524/v1 Publications: 6. Title: Alkaline gelatinised locust bean gum: alternative depressant for pyroxene and talc in Platreef ore (preprint, v1) Publications: 6. Scientific authors: 1. Name: Walter Amos Ngobeni Publications: 6. Scientific authors: 1. Orcid: Not set Publications: 6. Scientific authors: 1. Affiliations: 1. Ror: Not set Publications: 6. Scientific authors: 1. Affiliations: 1. Url: Not set Publications: 6. Scientific authors: 1. Affiliations: 1. Name: AECI Mining Chemicals Publications: 6. Scientific authors: 2. Name: Antoine F. Mulaba-Bafubiandi Publications: 6. Scientific authors: 2. Orcid: Not set Publications: 6. Scientific authors: 2. Affiliations: 1. Ror: https://ror.org/04z6c2n17 Publications: 6. Scientific authors: 2. Affiliations: 1. Url: Not set Publications: 6. Scientific authors: 2. Affiliations: 1. Name: University of Johannesburg Publications: 6. Citation: Walter Amos Ngobeni; Antoine F. Mulaba-Bafubiandi (2024). Alkaline gelatinised locust bean gum: alternative depressant for pyroxene and talc in Platreef ore (preprint, v1). https://doi.org/10.21203/rs.3.rs-4799524/v1 Publications: 6. Relation: supporting_source Publications: 6. Source type: unpublished_research Publications: 6. Publication year: 2024 Publications: 7. Doi: Not set Publications: 7. Url: https://www.altavandykenvironmental.co.za/wp-content/uploads/MM-Draft-Scoping-Report.pdf Publications: 7. Title: Mogalakwena Complex: Draft Scoping Report, February 2023 Publications: 7. Scientific authors: 1. Name: Réata Colyn Publications: 7. Scientific authors: 1. Orcid: Not set Publications: 7. Scientific authors: 1. Affiliations: 1. Ror: Not set Publications: 7. Scientific authors: 1. Affiliations: 1. Url: Not set Publications: 7. Scientific authors: 1. Affiliations: 1. Name: Alta van Dyk Environmental Consultants cc Publications: 7. Scientific authors: 2. Name: Kirthi Peramaul Publications: 7. Scientific authors: 2. Orcid: Not set Publications: 7. Scientific authors: 2. Affiliations: 1. Ror: Not set Publications: 7. Scientific authors: 2. Affiliations: 1. Url: Not set Publications: 7. Scientific authors: 2. Affiliations: 1. Name: Alta van Dyk Environmental Consultants cc Publications: 7. Scientific authors: 3. Name: Tyla Smith Publications: 7. Scientific authors: 3. Orcid: Not set Publications: 7. Scientific authors: 3. Affiliations: 1. Ror: Not set Publications: 7. Scientific authors: 3. Affiliations: 1. Url: Not set Publications: 7. Scientific authors: 3. Affiliations: 1. Name: Alta van Dyk Environmental Consultants cc Publications: 7. Scientific authors: 4. Name: Lenaldi Görgens Publications: 7. Scientific authors: 4. Orcid: Not set Publications: 7. Scientific authors: 4. Affiliations: 1. Ror: Not set Publications: 7. Scientific authors: 4. Affiliations: 1. Url: Not set Publications: 7. Scientific authors: 4. Affiliations: 1. Name: Alta van Dyk Environmental Consultants cc Publications: 7. Scientific authors: 5. Name: Alta van Dyk Publications: 7. Scientific authors: 5. Orcid: Not set Publications: 7. Scientific authors: 5. Affiliations: 1. Ror: Not set Publications: 7. Scientific authors: 5. Affiliations: 1. Url: Not set Publications: 7. Scientific authors: 5. Affiliations: 1. Name: Alta van Dyk Environmental Consultants cc Publications: 7. Citation: Réata Colyn; Kirthi Peramaul; Tyla Smith; Lenaldi Görgens; Alta van Dyk (2023). Mogalakwena Complex: Draft Scoping Report, February 2023. https://www.altavandykenvironmental.co.za/wp-content/uploads/MM-Draft-Scoping-Report.pdf Publications: 7. Relation: supporting_source Publications: 7. Source type: technical_report Publications: 7. Publication year: 2023 Publications: 8. Doi: 10.1007/s11367-026-02665-6 Publications: 8. Url: https://doi.org/10.1007/s11367-026-02665-6 Publications: 8. Title: Joint production with multiple determining products: the case of platinum-group metals Publications: 8. Scientific authors: 1. Name: Ivan Muñoz Publications: 8. Scientific authors: 1. Orcid: Not set Publications: 8. Scientific authors: 1. Affiliations: 1. Ror: Not set Publications: 8. Scientific authors: 1. Affiliations: 1. Url: Not set Publications: 8. Scientific authors: 1. Affiliations: 1. Name: 2.-0 LCA consultants Publications: 8. Scientific authors: 2. Name: Anastasia Papadopoulou Publications: 8. Scientific authors: 2. Orcid: Not set Publications: 8. Scientific authors: 2. Affiliations: 1. Ror: https://ror.org/03c6k9p96 Publications: 8. Scientific authors: 2. Affiliations: 1. Url: Not set Publications: 8. Scientific authors: 2. Affiliations: 1. Name: Haldor Topsoe (Denmark) Publications: 8. Scientific authors: 3. Name: Edith Buhl Publications: 8. Scientific authors: 3. Orcid: Not set Publications: 8. Scientific authors: 3. Affiliations: 1. Ror: https://ror.org/03c6k9p96 Publications: 8. Scientific authors: 3. Affiliations: 1. Url: Not set Publications: 8. Scientific authors: 3. Affiliations: 1. Name: Haldor Topsoe (Denmark) Publications: 8. Scientific authors: 4. Name: Bo P. Weidema Publications: 8. Scientific authors: 4. Orcid: 0000-0003-1863-6528 Publications: 8. Scientific authors: 4. Affiliations: 1. Ror: https://ror.org/04m5j1k67 Publications: 8. Scientific authors: 4. Affiliations: 1. Url: Not set Publications: 8. Scientific authors: 4. Affiliations: 1. Name: Aalborg University Publications: 8. Citation: Ivan Muñoz; Anastasia Papadopoulou; Edith Buhl; Bo P. Weidema (2026). Joint production with multiple determining products: the case of platinum-group metals. https://doi.org/10.1007/s11367-026-02665-6 Publications: 8. Relation: supporting_source Publications: 8. Source type: scientific_journal Publications: 8. Publication year: 2026 Publications: 9. Doi: Not set Publications: 9. Url: https://github.com/polca/premise/blob/850286212ca71e44ebbc0c90909640a5c5db62ae/premise/data/additional_inventories/lci-iridium-economic-proxy.xlsx Publications: 9. Title: premise static economic-iridium engineering compiler Publications: 9. Citation: premise static economic-iridium engineering compiler (2026). https://github.com/polca/premise/blob/850286212ca71e44ebbc0c90909640a5c5db62ae/premise/data/additional_inventories/lci-iridium-economic-proxy.xlsx Publications: 9. Relation: supporting_source Publications: 9. Source type: data_repository Publications: 9. Publication year: 2026
Version metadata	System boundary	Per kg iridium, the engineering economic factor is mean achieved Ir price 924.4 USD/troy ounce divided by 0.0311034768 kg/troy ounce and by the published 5018995769 USD annual seven-product basket. Product mass cancels in this per-kg formula; that algebra does not establish causal refining costs or a complete coproduct basket. It is a pooled average-price/average-basket scenario rather than year-by-year allocation. Chrome and other outputs are outside the inherited basket. Original annual electricity/fossil TJ series are averaged; fossil shares 2.55/3.72/0.23 are normalized over 6.5 and diesel split 96.3/3.7 percent is inherited from GREET. Literal rounded GREET tables and ounce/ton denominators have documented inconsistencies; do not rescale this reconstruction without confirming author intent and boundary. Retained historical supplier factors convert purchased fuel energy to service references, including coal 1.249925 and gas 1.052631579 MJ fuel per reference MJ. Fuel supply and direct combustion are owned once by those services; adding a second fuel or furnace process is unsupported. ZA is a geographic proxy for a corporate pool including Zimbabwe and purchased/toll-treated material. Complete upstream mining for purchased concentrate, supplier technology/reference years and actual export binding remain unresolved. Khumalo Table 3.2 gives North Concentrator pilot doses 273/46/130/306 g/t for SIBX/Senkol 3/Senfroth 516/Norilose 6064. The recipe applies their selected commercial-product interpretation only to North feed, inferred from the later 9.3/(9.3+4.2) Mtpa capacity ratio. Mean combined Mogalakwena feed is 13.091 million t/year; actual 2015–2019 North throughput is not measured by that 2023 planning ratio, and offsite Baobab treatment is documented. The 2024 preprint supports selected active fractions 95/40/100/60 percent but its SIBX text 95 percent conflicts with Table 1 93.5 percent. Both purity and commercial-versus-active dose basis remain scenarios. Sodium ethyl xanthate is a different alkyl-chain proxy for SIBX; a generic organophosphorus average is not actual dithiophosphate chemistry; short-chain polyether polyols are not a verified PPG 400 frother formulation; pure CMC excludes commercial carriers. Unmodelled commercial carrier/impurity mass and reagent environmental fate are not zero. No other-company ore recipe, waste treatment, dissolved release, toxicity equivalence or recovery credit is established by these manufacturing proxies. The 2020 ESG report printed 70 supplies previously missing 2019 SO2 at 21.97 kt; the existing foreground residual already uses the five-year 20.534 kt mean. Allocated target 121.592762938 kg/kg Ir less inherited direct utility SO2 11.381825897 gives current 110.210937042 kg. Subtract direct utility emissions once, not upstream supplier emissions; this assumes the corporate total includes utility combustion and uses historical provider evidence. Later 2019 total water withdrawal 25094 ML differs from 25894 ML in the 2019 report, but the separately used potable series 7642/6142/9433/12327/14408 ML is unchanged. Its allocated 59158.485383 kg less historical embedded softened water 165.078346 kg gives current 58993.407037 kg tap water. Boiler feed belonging to this potable budget remains an assumption; this is not complete withdrawal, return or net-consumption accounting. Corporate NOx has missing 2015 data and incompatible known-year/utility boundaries; do not turn missing values into zero or add a negative balancing emission. Published version 1.0.1 already contains 1 kg direct Ir-resource lower bound for 1 kg contained-metal output. It is not economically scaled extraction, observed purity, ore grade or 100 percent recovery. Historical 1.0.0 lacks that row; do not apply the resource addition again to the current version. Mining/refining losses, final-refinery chemicals, land and complete waste treatment remain unresolved.	An economically allocated share of pooled corporate operating electricity/fuel services, selected North-Concentrator reagent manufacture, direct SO₂ residual and potable-water supply per kg iridium. A separate contained-metal resource lower bound is included. Complete purchased-concentrate mining, final-refinery chemicals, land occupation, waste treatment, water returns and reagent fate are not established.
Version metadata	Technological representativeness	Not set	5
Version metadata	Technology description	Partial engineering inventory for 1 kg iridium at the producer gate, economically allocating 2015–2019 corporate PGM operating quantities using a mean achieved Ir price and published seven-product basket. Includes delivered electricity/fuel services, a corporate SO2 residual, four North-Concentrator flotation-manufacturing proxies and additional potable water. Pilot doses, later capacity share and reagent active fractions remain qualified transfers; final-refinery chemistry and full mining/emission/waste/water coverage are incomplete. This historical version lacks the later contained-Ir resource row; absence is not zero geological extraction.	The recipe extends the supporting GREET pooled PGM model to an independent economic-iridium scenario. Annual company quantities are averaged, then allocated using the mean achieved iridium price and a published seven-product basket. Pilot flotation doses, later North/South concentrator capacities and later reagent formulations are transferred as engineering assumptions. The South African location represents a corporate pool that also includes Zimbabwe and purchased or toll-treated material.
Version metadata	Temporal representativeness	Not set	4
Version metadata	Limitations on use	Per kg iridium, the engineering economic factor is mean achieved Ir price 924.4 USD/troy ounce divided by 0.0311034768 kg/troy ounce and by the published 5018995769 USD annual seven-product basket. Product mass cancels in this per-kg formula; that algebra does not establish causal refining costs or a complete coproduct basket. It is a pooled average-price/average-basket scenario rather than year-by-year allocation. Chrome and other outputs are outside the inherited basket. Original annual electricity/fossil TJ series are averaged; fossil shares 2.55/3.72/0.23 are normalized over 6.5 and diesel split 96.3/3.7 percent is inherited from GREET. Literal rounded GREET tables and ounce/ton denominators have documented inconsistencies; do not rescale this reconstruction without confirming author intent and boundary. Retained historical supplier factors convert purchased fuel energy to service references, including coal 1.249925 and gas 1.052631579 MJ fuel per reference MJ. Fuel supply and direct combustion are owned once by those services; adding a second fuel or furnace process is unsupported. ZA is a geographic proxy for a corporate pool including Zimbabwe and purchased/toll-treated material. Complete upstream mining for purchased concentrate, supplier technology/reference years and actual export binding remain unresolved. The later corporate report adds missing SO2 and changes total water withdrawal, while no new correction to the separately used potable series is established. This source update is reflected in the SO2 target; a formal erratum was not independently identified. Original preprint version 1 is posted 22 August 2024; fresh page state lists no version of record, associated publication or amendment, which does not prove a complete amendment history. The same authors' cassia-tora/locust-bean paper is a different study. Exact DOI Crossmark reports the 2026 Muñoz/Papadopoulou/Buhl/Weidema paper current, but complete supplementary history remains unproven. Its SI sections 3.8/4.8 reconstruct a refining-only consequential response using older refinery data and avoided residue disposal; Table SM 18 combines 0.624 ZA refining response and 0.376 reduced consumption per kg Ir. Those boundary, substitution and fuel assumptions do not correct or replace this attributional corporate-pool recipe. Current PEM stack 4856 buys 0.8 kg Ir, as in the pinned native caller, but has 3.9 declarations versus this 3.12 provider; actual migration/binding, loading, purity, stack life and recovery remain unverified. No extra lifetime multiplier, disposal credit or current amount correction is established. Static arithmetic agreement is not full inventory or scientific sign-off.	Company means, pilot doses, planning capacities, formulation purities and supplier contracts come from different years and scales. They do not establish iridium-specific process measurements, current prices, causal refining response, complete coproduct coverage or chemical/toxicity equivalence. Source rounding, carrier ownership, recovery losses and complete mining/refining inventories remain uncertain. The later company report is a source update; no formal applicable erratum was independently identified in the earlier review. Archived preprint and DOI-status checks do not prove a complete amendment history. The later consequential study supplies no recovery or avoided-disposal credit for this attributional recipe. External supplier terms remain separate.

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iridium production, economic allocation, proxy

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