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Moss Mine, Moss vein, Oatman, San Francisco District, Oatman District (San Francisco District; Union Pass District), Black Mts, Mohave Co., Arizona, USA

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Latitude & Longitude (WGS84): 35° 5' 58'' North , 114° 26' 48'' West
Latitude & Longitude (decimal): 35.09945,-114.44666
Köppen climate type:BWk : Cold desert climate


‡Ref.: The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Scottsdale, AZ: 70; The History of Arizona, Chap. X: 74; Schrader, F.C. (1909), Mineral deposits of the Cerbat Range, Black Mountains, and the Grand Wash Cliffs, Mohave County, Arizona: USGS Bull. 397: 170-172, 43; Wilson, E.D., et al (1934), AZ Bur. of Mines Bull. 137: 94; Ransome, F.L. (1923), Geology of the Oatman Gold District, Arizona, USGS Bull. 743: Plate 1, 33, 46-48; USGS 7.5 minute Oatman topo. map; AZ Dept. Min. Resources (ADMR) Householder map; Bur. Land Mgmt. District map; AZ Dept. Min. Resources (ADMR) Mohave card file; MRDS files #10027926 & 10283880; Galbraith, F.W. (1947), AZ Bur. of Mines Bull. 153, Minerals of AZ: 24; Galbraith, F.W. & Brennan (1959), Minerals of AZ: 84.

A former underground gold mine located in south-central sec. 19, T.20N., R.20W., 7 miles NW of Oatman and 2 miles North of Silver Creek in the old San Francisco District. This was the leading mine of the district.

Mineralization is an immense gold ledge, nearly 40 feet wide. The vein strikes N.78ºW. and dips 70ºS. It occurs in the Moss Quartz Monzonite-porphyry. The lode is from 20 to more than 100 feet wide at the West end. It is traceable for more than 1 mile on the surface. The vein filling consists of fine-grained white quartz asnd calcite with stringers of colorless to pale-green fluorite, The largest oreshoot consisted offree gold in iron-stained quartz but only to 65 feet deep.

Workings include shafts at 230 feet and 98 feet deep, respectively (1881), plus 1,700 feet of levels, drifts, etc.


Mineral List


11 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

Langhian - Chattian
13.82 - 28.1 Ma



ID: 2848155
Middle Miocene to Oligocene granitic rocks

Age: Cenozoic (13.82 - 28.1 Ma)

Description: Granite to diorite representing solidified magma chambers that were the likely source of overlying and nearby volcanic rocks of map unit Tv. The granitic rocks are typically equigranular and fine- to medium-grained. (14-26 Ma)

Lithology: Major:{granite,granodiorite,diorite}, Minor:{quartz diorite}

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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