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    Gold Ore: Highgrade gold ore from a quartz vein near Alma, Colorado. The appearance is typical of very good goldquartz ore. Metal ores are generally oxides, sulfides and silies of "native" metals (such as native copper) that are not commonly concentrated in the Earth''s crust. Ore bodies are formed by a variety of geological processes.

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    The Role of Arsenic in the Mining Industry Peru, and the Philippines, and from coppergold ores in Chile. Arsenic also may be recovered from enargite, a copper mineral. Global resources of copper and lead bearing minerals contain 11Noble, B.F., Introduction to Environmental Impact Assessment: A Guide to Principles and Practice, 2006

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