CAIRO CHEMICAL  COMPANY    Cairo, Ohio, USA

CARGILL FERTILIZER INC.    Riverside, Florida, USA

CHINO MINES COMPANY    Hurley, New Mexico, USA

CLIMAX MOLYBDENUM    Fort Madison, Iowa, USA

COMINCO LTD.    Trail, British Columbia, Canada

CYPRUS - CASA GRANDE   Casa Grande, Arizona, USA

ENAMI      Las Ventanas, Chile

ENAMI   Paipote, Chile

FALCONBRIDGE LTD.   Falconbridge, Ontario, Canada

INDUSTRIES CHIMIQUES DU SÉNÉGAL  Sénégal

KOCH SULFUR  PRODUCTS CO.   Wichita, Kansas, USA

NORANDA INC. - Brunswick Smelter   Belledune, New Brunswick, Canada

NORANDA INC. - CEZinc    Valleyfield Quebec, Canada

NORANDA INC. - Mines Gaspé   Murdochville, Quebec, Canada

NORANDA INC. - Fonderie Horne   Rouyn - Noranda, Quebec, Canada

NORANDA CHILE S.A. - Fundicion Altonorte La Negra, Chile

PALABORA MINING CO.    Palaborwa, South Africa

PHELPS DODGE HIDALGO.    Playas, New Mexico, USA

PHELPS DODGE MIAMI    Claypool, Arizona, USA

PVS CHEMICALS   Buffalo, New York, USA

RHONE POULENC    California, USA

R.P.C. CONCON     Concon, Chile

SAVAGE ZINC      Clarksville, Tennessee, USA

THE DOE RUN COMPANY    Herculaneum, Missouri, USA.