- ArcelorMittal
- Avalon Rare Metals Inc.
- Dupont
- Gejiu Zili Mining and Smelting Co. Ltd
- Guangxi China Tin Group Co. Ltd
- Indium Corporation
- Malaysia Smelting Corp.
- Metallo Chimique international NV
- Minsur SA
- PT Timah TBK
- Thailand Smelting and Refining Co. Ltd
- Yunnan Chengfeng Non-Ferrous Metals Co. Ltd
- Yunnan Tin Company Group Limited