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Alamo group of claims, Alamo Springs District, Kofa Mts (S.H. Mts), Yuma Co., Arizona, USA

A Cu-Au group of several claims located in North-central sec. 15, T1N, R16W, in the area around the head of Cemitosa Wash, along the West base of mesas north of a low divide, in the northern Kofa Mts (S.H. Mountains).

Mineralization is generally weak and spotty, oxidized copper mineralization in small, irregular veins and seams along shear or fault zones in andesite porphyry or closely associated granitic intrusive, along a major northwest-striking structural zone. Basic dike rock is highly altered with numerous slip planes exposed in the workings.

Workings include shallow holes or short drifts.

References

McConnell, A.B. (1911) Review of mining in Arizona, 1910: Mining World [Chicago]: 34: 143-147.

Jones, E.L., Jr. (1915), A Reconnaissance in the Kofa Mountains, Arizona, USGS Bull. 620: 163-164.

Wilson, E.D. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 116-121.

Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining (revised 1967), Arizona Bureau of Mines Bull. 137: 143.

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: 115 (Table 4).

Arizona Bureau of Mines file data.

Mineral List

Chrysocolla
Malachite


2 entries listed. 2 valid minerals.

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