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

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

This page is currently not sponsored. Click here to sponsor this page.
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

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, used under Creative Commons Attribution 4.0 License

This page 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.
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 21, 2018 16:31:25 Page generated: December 5, 2017 01:40:25
Go to top of page