Sumitomo Metal Mining's Toyo Smelter & Refinery Achieved The Copper Mark

Sumitomo Metal Mining Co., Ltd. (TSE: 5713) is pleased to announce that its Toyo Smelter & Refinery (Saijo City, Ehime Prefecture, Japan) has achieved The Copper Mark as of November 18, 2025.

The Copper Mark is an international framework established by the International Copper Association in 2019 to assure responsible production practices in the copper industry from the perspectives of environment, social, and governance (ESG). The initiatives undertaken at the Toyo Smelter & Refinery were objectively evaluated as meeting internationally recognized high standards for ESG, leading to the acquisition of this certification.