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Dome District (Gila City District), Gila Mts, Yuma Co., Arizona, USA

A Au-Ag-marble-Cu mining area located in T8S, R21W at the North end of the Gila Mountains.

Mineralization is varied: (1) Gold-bearing Quaternary gravels, up to 15 feet thick, in gulches, benches, and terraces over Tertiary sediments on a North-sloping pediment faulted against Mesozoic schist and gneiss of the mountain mass; (2) Zone of variable marble interbedded with schist and quartzite, about 150 feet wide, in metamorphosed Mesozoic sedimentary beds, crossing the North end of the Gila Mountains; and (3) Spotty and weak oxidized copper and gold ores in irregular, lensing quartz veins cutting metamorphosed Mesozoic sediments.

Workings are mostly dry placer operations worked mainly from 1858 to about 1865, and sporadically, on smaller scale, mainly from 1931-1943 and 1946-1950. Estimated and recorded production would be close to 26,000 oz. Au and about 1,200 oz. Ag. Also shallow prospects.

References

Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 181-189, 200-201, 202-207, 208-210.

Wilson, E.D. (1961) Gold Placers and Placering in Arizona. Arizona Bureau of Mines Bull. 168 (revised 1978): 18-21.

Johnson, M.G. (1972), Placer gold deposits of Arizona, USGS Bull. 1355, 103p.: 67-69.

Keith, Stanton B. (1978) State of Arizona Bureau of Geology and Mineral Technology, Geological Survey Branch Bull. 192, Index of Mining Properties in Yuma County, Arizona: 145 (Table 4).

Arizona Bureau of Mines file data.

Mineral List

Mineral list contains entries from the region specified including sub-localities
'Bentonite'
Calcite
Chrysocolla
'Clinoptilolite'
Gold
Hematite
Limonite
Malachite
Muscovite
var: Sericite

Quartz
Wulfenite


12 entries listed. 7 valid minerals.

Localities in this Region

USA

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