ASI certifies Century Aluminum Company against Performance Standard V3.1 with Provisional status

9 October 2025

Century Aluminum Company has achieved ASI Performance Standard V3.1 (2023) with Provisional status for bauxite mining operations including land management and railway operations, and alumina refinery operations at their Century Aluminum Jamalco facility in Clarendon, Jamaica.

Aluminium Stewardship Initiative (ASI) today announced that Century Aluminum Jamalco has been certified against the ASI Performance Standard V3.1 (2023). A joint venture between Century Aluminum Company and Clarendon Alumina Production Ltd., Jamalco produces 1.425 million metric tonnes per year of smelter-grade alumina for North American and European markets. Its integrated operations span three bauxite mining sites, an alumina refinery using the Bayer process, a dedicated power plant, engineered residue storage areas, and an on-site port facility. Century Aluminum has been an ASI member since 2020, when its Nordural facility in Grundartangi, Iceland was certified. Its headquarters office in Chicago was added to the certification through a surveillance/scope change audit in 2021.

The ASI Certification program was developed through an extensive multi-stakeholder consultation process and is the only comprehensive voluntary sustainability standard initiative for the aluminium value chain. The ASI Performance Standard V3 and ASI CoC Standard V2 were launched in May 2022 following a multi-year revision process. The ASI Performance Standard V3 defines 11 principles and 62 criteria under three sustainability pillars – Environment, Social, and Governance – with the aim to address pressing sustainability issues in the aluminium value chain, such as biodiversity, Indigenous Peoples rights, circularity, and greenhouse gas emissions. The 2022 Standards and related documents underwent a minor update in 2023, accounting for editorial changes, correction of minor errors and for general clarification, culminating in the release of Performance Standard V3.1 (2023) and Chain of Custody Standard V2.1 (2023).

The Provisional Certification serves as a strategic and flexible approach for aluminium sector actors to gain access to ASI’s sustainability standards framework, learn, and improve their practices over a defined period. It provides an opportunity for Members to commence their ASI Certification journey, while requiring a commitment to move towards Full Certification as soon as is practically possible.

The independent, third-party audit of Jamalco was carried out by DNV Business Assurance Services UK Ltd. A full listing of audit findings is available in the summary audit reports, linked below. Twenty-five minor non-conformances were noted under Criteria 2.4a-e Responsible Sourcing, 2.5a-g Environmental and Social Impact Assessments, 2.6a-h Human Rights Impact Assessment, 2.9a-b Mergers and Acquisitions, 3.1a-b Sustainability Reporting, 3.4a-f Stakeholder Complaints, Grievances and Requests for Information, 5.1a-b Disclosure of GHG Emissions and Energy Use, 5.3b-e GHG Emissions Reduction Plans – Targets, review and disclosure, 5.4 GHG Emissions Management, 6.1a-f Emissions to Air, 6.2a-g Discharges to Water, 6.3a-g Assessment and Management of Spills and Leakages, 6.4a-b Public Disclosure of Spills and Leakages, 7.1a-b Water Assessment and Disclosure, 7.2a-e Water Management, 8.1a Biodiversity and Ecosystem Services Risk and Impact Assessment, 8.1b Biodiversity and Ecosystem Services Risk and Impact Assessment – Priority, 8.2a-g Biodiversity Management, 8.7a-i Mine Rehabilitation, 9.1a-d Human Rights Due Diligence, 9.2a-e Gender Equity and Women’s Empowerment, 9.6a-i Displacement, 10.3a-c Forced Labour, 10.8a-c Working Time and 11.1b-e Occupational Health and Safety (OH&S) Management System – Reviews and disclosure. Three major non-conformances were identified under Criteria 5.3a GHG Emissions Reduction Plans, 8.3a-c Management of Priority Ecosystem Services and 8.4 Alien Species, resulting in a Certification with Provisional status of one year. Jamalco will be implementing corrective actions, to be verified in a follow-up audit. DNV Business Assurance Services UK Ltd. approved the corrective action plans for the Major non-conformances prior to submission of the audit report to ASI.

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