Hughes Mine group (Hughes Copper group), Esperanza Mine group [old], Pima Mining District (Olive Mining District; Mineral Hill Mining District; Twin Buttes Mining District), Sierrita Mountains, Pima Co., Arizona, USAi
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Key
Latitude & Longitude (WGS84):
31° 51' 45'' North , 111° 6' 20'' West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~0km
Köppen climate type:
Ref.: Ransome, F.L. (1922) Ore deposits of the Sierrita Mountains, Pima County, Arizona, in Contributions to Economic Geology (Short Papers and Preliminary Reports), 1921 - Part I.--Metals and Nonmetals except Fuels: U.S. Geological Survey Bulletin 725J: 427.
Anderson, C.A., and Kupfer, D.H. (1945) Report on the properties of the Amargosa Molybdenum and Copper Corporation, Pima County, Arizona: U.S. Geological Survey Open-File Report [unnumbered], 20 p., 8 sheets.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 135 (Table 4).
Arizona Bureau of Mines file data.
A Pb-Zn-Cu-Ag-Au-Mo mine located in T.18S., R.12E Owned at times, or in part, by the Chesterfield Copper Co.; Elston Esperanza Co.; the Blanche Rose Mining Co.; Pike; and the Magnet Copper Co.
Mineralization is partly oxidized, relatively weak and irregular, quartz-calcite fissure veins containing spotty sulfides in Cretaceous sedimentary-volcanic rocks. Locally low-grade, disseminated copper and molybdenum mineralization in siliceous, brecciated Laramide quartz monzonite porphyry, Cretaceous rocks, and quartz masses.
The group was originally prospected in Spanish colonial times. Intermittent production occurred mainly from the early 1900's through 1943, on a small scale, producing about 2,000 tons of ore averaging some 12% Pb, 4% Cu, 12 oz. Ag/T and minor Zn & Au. For later production under Duval, see the Esperanza open pit mine.
List of minerals for each chemical element
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