Geology and mineral deposits of the northern half of the Mt. Tobin mining district, Pershing County, Nevada
AuthorPerry, Richard Michael
Geological Sciences and Engineering
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The Northern half of the Mt. Tobin Mining District, 45 miles south of Winnemucca in the Tobin Range, produced 1073 flasks of mercury and minor silver and gold from deposits located near the northern margin of a late Tertiary vo1cano-tectonic graben. This graben is bounded to the north by a fault which juxtaposes complexly deformed sediments of the late Paleozoic Havallah sequence with Triassic sediments and Tertiary volcanics which fill the graben. Two types of mineralization are present; (1) Tertiary epithermal mercury—gold-silver mineralization which is structurally controlled by the graben-bounding fault and (2) stratiform volcanogenic silver mineralization in the Havallah sequence. Analyses of 171 samples of Tertiary mineralized rocks indicate a vertical zoning of gold, silver, arsenic, antimony and mercury in vein and fossil hot springs deposits.
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