Affiliation: | 1.Kennecott Copper Co.,Utah,USA;2.Noranda Mines, Ltd.,Toronto,Canada;3.El Paso Smelter,American Smelting and Refining Co.,Tucson,USA;4.Anaconda Smelter,The Anaconda Co.,Anaconda,USA;5.Tennessee Copper Co.,Copperhill,USA;6.International Nickel Co.,Copper Cliff,Canada;7.Palabora Mining Co.,Phalaborwa, Transvaal,South Africa;8.Kennecott Copper Co.,Salt Lake City,USA |