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USA. Arizona state. Kearny. Ray Mine. Ray Operations belongs to the Asarco Grupo Mexico.The Ray mine is a large copper mine. Ray represents one of the largest copper reserves in the United States and in the world, having estimated reserves of 1 billion tonnes of ore grading 0.5% copper. The Ray Operations consists of a 250,000 ton/day open pit mine with a 30,000 ton/day concentrator, a 103 million pound/year solvent extraction-electrowinning operation, and associated maintenance, warehouse and administrative facilities. Cathode copper produced in the SX-EW operation is shipped to outside customers and the Asarco Amarillo Copper Refinery. A local railroad, Copper Basin Railway, transports ore from the mine to the Hayden concentrator, concentrate from the Ray concentrator to the smelter, and sulphuric acid from the smelter to the leaching facilities. 29.01.16 © 2016 Didier Ruef