Mining "Invisible" Gold: Heap Leaching and Nevada's …
In Nevada, evolving milling technology began with the Washoe process of pan amalgamation developed on ia City's Comstock Lode in the early 1860s. The Washoe process evolved di-rectly from the much older, open-air and ground-based patio process that used arrastras. Washoe pans were large iron tubs filled with a slurry of
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