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

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A Cu-Au mining district located in T1N R16W & T1S, R18W, in the northern Kofa Mts (S.H. Mountains).

Mineralization in the district is varied: (1) 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; (2) Spotty, finely divided, free gold in fractures and breccia with gouge, calcite, and iron and manganese oxides, in andesitic volcanics; and, (3) Minor placer gold in washes close to gold deposits.

Workings are relatively shallow shafts, tunnels, trenches and pits, mostly worked in early 1900's. Some 65 tons of 1.4% Cu with minor silver and 100 tons of .80 oz. Au/T and 1.o oz. Ag/T reported as produced but some gold probably sold to ore buyers from numerous prospects and placer operations.

References

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

Jones, Jr., E.L. (1915), A Reconnaissance in the Kofa Mountains, Arizona, USGS Bull. 620: 151-164.

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

Mineral list contains entries from the region specified including sub-localities

Calcite Chrysocolla Gold

'K Feldspar var: Adularia' Limonite Malachite

Quartz var: Chalcedony 'Wad'

9 entries listed. 5 valid minerals.

Localities in this Region

USA Arizona Yuma Co. Kofa Mts (S.H. Mts) Alamo Springs District Alamo group of claims Kofa Game Range Cemitosa Wash Cemitosa prospect Ocotillo Geyser lode Geyser Mine (Silent King Mine) IXL Mine (I.X.L. prospect; IXL prospect) Rand prospect Red Raven Wash Big Horn prospect

USA Arizona Yuma Co. Kofa Mts (S.H. Mts) Alamo Springs District Kofa Game Range Ocotillo Red Raven Wash C.O.D. Mine (C.O.D. prospect; C.O.D. group of claims) Regal group of claims (Regal prospect) Regal claim Regal No. 1 claim Palm Canyon Kofa Queen Mine (Kofa Mine) Regal prospect (Regal group prospect) Ocotillo Owl Head Ocotillo Mine group Wintersburg Tunnel Spring Mine (Tunnel Springs prospect; Tunnel Springs group of claims; Ramshorn prospect)