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Mining in Arizona | AZGSThe earliest miners in what is now Arizona were Native Americans who chiefly mined surface outcrops of salt, clays, hematite, quartz, obsidian, stone, turquoise, and coal. In the late 1600s, Spanish explorers hunted for metallic deposits with especial interest in gold and silver.
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Quartz WikipediaNaturally occurring quartz crystals of extremely high purity, necessary for the crucibles and other equipment used for growing silicon wafers in the semiconductor industry, are expensive and rare. A major mining location for high purity quartz is the Spruce Pine .
Placer Gold Deposits of New Mexico USGSthe placer gold deposits of New Mexico, one of a series of four papers ... Bureau of Mines and the Geological Survey, and in many mining journals. Placer gold production, in ounces (table 1) was compiled from ... (more than 300 ft. thick) of locally derived unconsolidated sand and gravels that range in age from Pliocene (?) to ...
New Mexico: Bureau of Mines Mining Bulletin 117 (Part 1 ...New Mexico Bureau of Mines Mineral Resources Bulletin 117 ... wellsorted, finegrained quartzsand beds (Grauten, 1965; Watson, 1979); it averages about 26% in porosity and 50 millidarcies in permeability (Table 12). ... arcuate, highangle faults have stratigraphic displacements on the order of 6001,200 m (Fig. 11). As the Guadalupe ...
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