Donate now to keep alive!Help|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on Mindat
What is a mineral?The most common minerals on earthMineral PhotographyThe Elements and their MineralsGeological TimeMineral Evolution
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

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

This page is currently not sponsored. Click here to sponsor this page.
Latitude & Longitude (WGS84): 34° 10' 46'' North , 113° 50' 35'' West
Latitude & Longitude (decimal): 34.1794444444, -113.843055556

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

4 valid minerals.

Localities in this Region


The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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.

Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © and the Hudson Institute of Mineralogy 1993-2018, except where stated. relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: January 18, 2018 06:03:00 Page generated: May 3, 2017 20:20:09
Go to top of page