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Mystery Hill Mine group, Swansea, Santa Maria District (Planet District; Swansea District; Bill Williams District), Buckskin Mts, La Paz Co., Arizona, USA

Latitude: 34°10'46"N
Longitude: 113°50'35"W
A former underground Cu-Ag-Au-Pb-Fluorspar-(Se) mine group located in West-central and the SE¼ sec. 17 and the East-central and center parts of sec. 18, T10N, R13W, GSRM, (Ives Peak 15 minute topo map), 1.1 km (0.7 mile) NNE of Swansea and East of the Arizona-Montana Mines, 4½ miles E of Planet, 25 miles NE of Bouse, on federal wilderness land (Buckskin Mountains Wilderness area). Started in the late 1800's and operated sporadically until 1945. Owned at times, or in part, by Graves; Rogers; Haydon and Farmosano; Quick; El Tigro Mining Co.; El Pluma Mines, Inc.; Townsend Mining Co.; French; Coronation Mining Co.; Boyd and Napel; and, Ore Concentrates, Inc. MRDS database stated accuracy for this location is 100 meters.

NOTE: Alternate coordinates provided: 34.20833N, 113.63556W; and, 34.2064N, 113.6367W.

Mineralization is copper carbonates and silicates, with local lead carbonate, in fissure veins associated with strong silicification and some epidote, fluorite and selenite, in altered Precambrian schist and gneiss along predominently NW-trending, NE-dipping fault zones. The mineralization is Oligocene in age. Scattered erosional remnants of Paleozoic limestone with intrusive plugs and dikes of Laramide monzonite containing Paleozoic limestone inclusions. The mineralization is associated with low-angle detachment faulting; ore bodies are within and immediately above the micro-brecciated detachment surface; irregular hydrothermal replacement. Local rocks include Jurassic to Cambrian metamorphosed sedimentary rocks and/or Tertiary to Early Proterozoic gneissic rocks.

Regional geologic structures include a regional trend: blanket.

First worked in the late 1880's, and sporadically through 1945. Produced over 500 tons of ore averaging about 3% Cu, 2 oz. Ag/T, 0.5% Pb, and 0.1 oz Au/T.

Mineral List

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

4 entries listed. 3 valid minerals.

Localities in this Region


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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).

Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.

Tosdal, B.B., et al (1990), USGS Bull. 1701-G: G5, G7, G12-G13.

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 9 (Table 1).

Arizona Bureau of Mines file data.

U.S. Bureau of Mines card file.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10027673 (#M003779) & 10065099 (#TC40108), & 10210700.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID # 0040120355.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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