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Black Hawk Mine, Blue Bell Mining District, Tooele Co., Utah, USA : Structure: Basin And Range Accessory Fissures (N 60-70 E, N, N 20 E, E) Surrounding Strata (EW, Low N) Alteration: Partily Oxidized Ore Tectonics: Sevier Orogenic Belt Deposit: Fracture-controlled . ....