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Uses Of Tungsten Ores Mining Equipment And Mine Design

are various gold-in-quartz ores that also contain tungsten-bearing scheelite. The United States imported 80 pct of the tungsten consumed in 1987, up from 50 pct in 1981 1.4 With no U.S. tungsten mines operating in 1987, tungsten consumption was supplied from imports and Government stockpile excesses. Although the United

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