- AngloAmerican Corporation
- Apollo Management, USA
- Arcon International Resources Plc, Ireland
- The Asian Development Bank
- Atacama Minerals Inc, USA
- Atlantic Consulting Economists Ltd, Canada
- Aventis Animal Nutrition SA, France
- Avocet Mining Plc, UK
- Banc of America Securities LLC
- Barclays Capital
- BHP Billiton
- The Boeing Company
- Brunner Mond (UK) Limited
- CTT, Morocco
- China Molybdenum
- Chevron Mining
- Dampier Salt, Australia
- Dundee Plemeniti Metali
- Egyptian Salt & Minerals Co
- EIC Foundation, Estonia
- Elementis Chromium, UK
- Elkem Materials, Norway
- The European Commission
- Falcon Mines SA, Luxembourg
- First Quantum Minerals
- Goldman Sachs
- Goro Nickel (Vale), New Caledonia
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- Graymont Inc.
- HC Starck, Germany
- Hydro Chemicals, UK
- Hg Capital, UK
- Industria Quimica del Nalon SA, Spain
- JinDuiCheng Molybdenum Import & Export
- J. P. Morgan plc, UK
- Krebs & Co Ltd, Switzerland
- Labrador Iron Mines, Canada
- Lafarge Plâtres, France
- Lynas Corporation Limited, Australia
- Magnesitas de Rubian SA, Spain
- Mandoval Ltd, UK
- Marubeni Corporation, Japan
- Metal Mining Agency of Japan, Japan
- Micon International, Canada
- MIM Holdings, Australia
- Mitsui & Co UK Plc
- Morgan Stanley
- Nikom AS, Czech Republic
- Pan Andean Resources Plc, UK
- PWT Australasia Pty Ltd
- Cie Saint-Gobain, France
- Société Chimique Alkimia, Tunisia
- Sumitomo Corporation of America
- Vulcan Gulf Coast Materials Inc, USA
- Western Mining Corporation Ltd, USA
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