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high end environmental coal gold ore separating line in Benin City

As an example, for underground copper,gold, silver, and uranium mines in the United States, the ratio of overburden and waste rock toore, is on the order of 0.1:1 to 0.3:1. For surface mines, the ratios range from 2:1 to 10:1 on average (EPA,) 1985; based on data from the U.S. Bureau of Mines).

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