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Lost Spaniard Mine, Belmont Mountain, Tonopah, Osborn District, Big Horn Mts, Maricopa Co., Arizona, USA

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Latitude & Longitude (WGS84): 33° 41' 16'' North , 112° 55' 32'' West
Latitude & Longitude (decimal): 33.6877777778, -112.925555556
Other regions containing this locality:Sonoran Desert, North America


‡Ref.: Allen, G.B. (1985), Economic Geology of the Big Horn Mountains of west-central Arizona: Arizona Bureau of Geology & Mineral Technology open-file report 85-17.

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

US Bur. Mines card file.

Arizona Department of Mineral Resources (ADMR) Lost Spaniard Mine file.

U.S. Bureau of Mines file data - cluster No. 564 - Lost Spaniard Mine.

USGS 15 minute Belmont Mountains topo. map.

Arizona Department of Mineral Resources (ADMR) "U" file.

Flagg, A., Vanadium Report, book I; Arizona Bureau of Geology and Mineral Technology clippings file.

MRDS database Dep. ID files #10027548 & 10113336.

A former underground Ag-Cu-Pb-Zn-Au-V mine located in the NE¼ sec. 23 & NW¼ sec. 24, T.4N., R.7W. (Belmont Mts 15 minute topo map).

Mineralization is a vein deposit that includes oxidized copper minerals. Host rock is an unnamed rhyolite and andesite dikes. Ore control was a fault zone.

Mineral List


8 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Pleistocene - Middle Pleistocene
0.0117 - 0.781 Ma
Late and middle Pleistocene surficial deposits

Age: Pleistocene (0.0117 - 0.781 Ma)

Description: Unconsolidated to weakly consolidated alluvial fan, terrace, and basin-floor deposits with moderate to strong soil development. Fan and terrace deposits are primarily poorly sorted, moderately bedded gravel and sand, and basin-floor deposits are primarily sand, silt, and clay. (10-750 ka)

Lithology: Major:{gravel,sand}, Minor:{silt,clay}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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