TSM Verification Summary Report - Facility Information Verifier and Verification Information

Summary of the The activities undertaken during the verification process are verification activities summarized below: • Prior to the verification, copies of the facility’s self-assessments and supporting documentation were made available and were reviewed • An opening meeting was held including an overview presentation made by the facility, followed by a site tour. [...] The strategy and risks and opportunities are described in the Arch 2022 Sustainability Report. [...] The internal audit determined the tailings management system has been developed and implemented and conforms with the MAC Guide, that the Emergency Response Plan has been developed and is in conformance with the MAC Guide and that the ERP is tested. [...] Roles and responsibilities are defined in the corporate documents and in the Leer Water Management Plan. [...] Statement of Verification Statement of Verification The external verification was conducted in The external verification was conducted in accordance with the Terms of Reference accordance with the TSM Verifier Terms of for Ver.