Picks & Pans: Prospecting for Lode Gold
October 1999 by Edgar B. Heylmun, PhDMost of the world's ore deposits have been found by prospectors, not by geologists nor mining engineers. This article has been prepared with this fact in mind.
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…there are loads of different copper minerals, but a large number of them form first in the ground as chalcopyrite and then through the effects of weathering are changed into other minerals like malachite, cuprite and chrysocolla.
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Heading north into Tuolumne County on California’s Highway 49—the “Golden Highway”—from Mariposa County, you see few traces of the gold rush days because the largest mining town of the period is now covered by Don Pedro Reservoir. If you slow down and take a careful look, along the shores of the lake are numerous streaks of tailings that mark the mines of the old town of Jacksonville.
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