Averill, C. V., Placer mining for gold in California: California Div. Mines ... Rickard, T. A., Sampling and estimation of ore in a mine, New York, Hill
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The large mines processed gold at a unit cost of 341/ounce., ... The bottom line: placer mining, is that it is not always an easy way to make a living.
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Placer deposits are renowned for the difficulties inherent in the estimation of their mineral reserves. Mining and treatment often produce a recovered grade very ...
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In 1974 the Bureau of Mines began a systematic assessment of mineral supplies under its minerals availability program. To aid in this program, a technique was ...
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