The Basics of Small-Scale Heap Leaching with Cyanide Part I—History, Suitablility and Permitting
July 2007 by Chris RalphHardrock mining is usually done on a large scale, and although a few small-scale hardrock operations still exist, it’s not an easy operation to start up and run profitably.
In 2003, I initiated field reconnaissance of an opal deposit at Cedar Rim in central Wyoming and was amazed at the size of this undocumented deposit located right in the middle of an oil and gas field...
Virginia Elvira Russell
(Mining Grandma of Humbug)
March 4, 1999
Excerpts from California Mining Journal, our original title, published 50 years ago this month.
In this review of precious and base metal deposits in Arizona, it is apparent that several significant mines and mineral deposits occur in eastern Arizona, and there is considerable potential for new discoveries.
Q: I have tried various leaching techniques from which I cannot get a precipitate.
Q: I have a question/request regarding some black sand left from my Dad’s prospecting days.
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