- Aegean Perlites SA, Greece
- 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
- Billiton International Metals BV, Netherlands
- The Boeing Company, USA
- Brunner Mond (UK) Limited
- Dampier Salt, Australia
- Egyptian Salt & Minerals Co
- Elementis Chromium, UK
- Elkem Materials, Norway
- The European Commission
- Falcon Mines SA, Luxembourg
- H C Starck, Germany
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- Hydro Chemicals, UK
- Industria Quimica del Nalon SA, Spain
- Krebs & Co Ltd, Switzerland
- Lafarge Pltres, France
- Lynas Corporation Limited, Australia
- Magnesitas de Rubian SA, Spain
- Mandoval Ltd, UK
- Marubeni Corporation, Japan
- MIM Holdings, Australia
- Mitsui & Co UK plc
- Nikom AS, Czech Republic
- Nuclemon, Brazil
- Pan Andean Resources plc, UK
- PWT Australasia Pty Ltd
- Cie Saint-Gobain, France
- Societe Chimique Alkimia, Tunisia
- Vulcan Gulf Coast Materials Inc, USA
- Western Mining Corporation Ltd, USA
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