Affiliate members
Total members: 29
| AB Ferrolegeringar | Sweden |
| Afton Chemical Corp. | USA |
| Ankerpoort NV | Netherlands |
| Baja Mining Corp. | Canada |
| Carus Chemical Company | USA |
| Centre de Recherches Metallurgiques (CRM) | Belgium |
| Glencore International AG | Switzerland |
| Guangxi Jianghang International Trade Co. Ltd. | China |
| Italiana Prodotti Minerali (I.P.M.) | Italy |
| Kam Wah Minerals Trading Limited | China (Hong Kong) |
| L & M Handels AG | Germany |
| Marubeni Tetsugen Co. Ltd. | Japan |
| Metmar Limited | South Africa |
| Mitsui & Co. UK Plc | Japan |
| Noble Resources Ltd. | China (Hong Kong) |
| Ntsimbintle Mining (Pty) Ltd | South Africa |
| Omni Industries BV | Netherlands |
| Oreport (Pty) Ltd | South Africa |
| POS HIMETAL | South Korea |
| Ronly Holdings Ltd. | United Kingdom |
| Shaanxi Energy Metals & Minerals Resources Co. | China |
| SKI Shanghai Limited | China |
| Sojitz Corporation | Japan |
| Sumitomo Corporation | Japan |
| The David D. Joseph Company | U.S.A. |
| Tinfos Nizi S.A. | Luxembourg |
| Tokyo Boeki Steel & Materials Ltd. | Japan |
| Traxys France S.A.S. | France |
| Zhejiang Materials Industry International Co., Ltd | China |