THE DUVAL CORP.'S SIERRITA MINE. THE OPEN PIT MINE IS 300 FT. DEEP AND WILL EVENTUALLY BE WORKED DOWN TO 1800 FT 099

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Keywords: ., 099, 300, 1800, archive, bygone, corp., deep, duval, eventually, ft, ft., historic, history, open, pit, sierrita, usa, vintage, worked