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Geology and Ore Deposits
The district is underlain by northwest-trending belts of slate of the Mariposa Formation (Upper Jurassic), setpentine, and greenstone. There are several massive quartz veins in slate or greenstone. The ore contains free gold, pyrite, and arsenopyrite, which often is associated with highgrade ore. The Mariposa mine has been developed to an inclined depth of 1500 feet.
Evans II, Kane, Mariposa $2,395,000, Stockton Creek, Stockton Creek Tunnel.
Bowen, O. E., 1957, Mariposa County, Mariposa mine: California Jour. Mines and Geology, vol. 53, pp. 128-130.
Logan, C. A., 1935, Mother Lode gold belt-Mariposa County: California Div. Mines Bull. 108, pp. 180-190.
Ranwme, F. L., 1900, Mother Lode district folio: U.S. Geol. Survey Geol. Atlas of the U.S., folio 63, 11 pp.
Storms, W. H., 1900, The Mariposa mine: California Min. Bur. Bull. 18, pp. 142-143.
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