Ref.: Bancroft, H. (1911), Reconnaissance of the ore deposits in northern Yuma County, Arizona, USGS Bull. 451: 47-55.
Harrer, C.M. (1964), Reconnaissance of Iron Resources in Arizona, US Bureau of Mines Information Circular 8236: 130-133.
Klemic, H. (1969) Iron, in USGS & Arizona Bureau of Mines, and U.S. Bureau of Reclamation (1969), Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180 (USGS Bull.871): 168-182.
Elevatorski, E.A. (1978), Arizona Industrial Minerals, Arizona Department of Mineral Resources, Minerals Report No. 2: 68.
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: 173 (Table 4).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10209651, MRDS ID #M003887, MAS ID #0040120004.
A former underground Cu-Fe-Ag-Au mine group located in the NW¼NE¼NW¼ sec. 6, T.10N., R.16W. & the center of sec. 31, T11N, R16W, on private land. Discovered 1863. Owned at times, or in part, by Polhamus; Planet Copper Mining Co.; New Planet Copper Mining Co.; Northwest Leasing & Development Co.; Kimball Leasing Co.; and, Craig. The Arizona Ranch And Metals Co. had unspecified involvement here (1967).
Mineralization is copper carbonates and silicates with some copper sulfides and pyrite in depth, carrying minor gold and silver, in disseminations and veinlets in stratiform irregular, lensing, replacement bodies of specular and massive hematite. The wall rock is brecciated Paleozoic limestone and shale, along an apparent strong flat fault zone, with gouge, quartz, calcite, and feldspar lying above Precambrian metamorphics. The ore zone is 549 meters long, 61 meters wide, with a depth to top of 52 meters, and is 49 meters thick.
Workings include numerous scattered shafts, tunnels, adits and open cuts. Worked sporadically from 1863 through 1937, producing at least 60,000 tons of ore averaging about 10% Cu, and minor Ag and Au.
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