Omega Extension Mine, Monument Mountain, Helvetia, Helvetia-Rosemont District, Santa Rita Mts, Pima Co., Arizona, USA
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|Location is approximate, estimate based on other nearby localities.|
|Latitude & Longitude (WGS84):||31° 51' 21'' North , 110° 46' 9'' West (est.)|
|Margin of Error:||~0km|
|Other regions containing this locality:||Sonoran Desert, North America|
|Köppen climate type:||BSk : Cold semi-arid (steppe) climate|
Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 92, 115-117.
Creasey, S.C. & G.L. Quick (1955), Copper deposits of part of Helvetia mining district, Pima County, Arizona, USGS Bull. 1027-F: 320.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 127 (Table 4).
Arizona Bureau of Mines file data.
A Cu-Ag-Pb-Zn-Au-Mn mine located in West-central sec. 24, T.18S., R.15E. Owned at times, or in part, by Zeckendorf; the Omega Copper Co.; and, McKay.
Mineralization is partly oxidized copper and minor lead-zinc minerals, largely soft and earthy, with manganese and iron oxides, and local massive chalcopyrite and pyrite, in replacement bodies with garnet-magnetite gangue along a fault zone between Paleozoic limestone and Precambrian granodiorite.
Workings include tunnel, shaft, and open cuts. One of the earliest mines, producing sporadically some 7,000 tons of ore averaging about 6% Cu, 1 oz. Ag/T and minor Pb from the 1880's to 1920.
2 valid minerals.
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