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Lead Mountain Mine (Main Barite Mine), Lead Mountain [2], Barstow, Barstow District, San Bernardino Co., California, USA

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Latitude & Longitude (WGS84): 34° 55' 12'' North , 116° 56' 9'' West
Latitude & Longitude (decimal): 34.92000,-116.93611
Köppen climate type:BSk : Cold semi-arid (steppe) climate

A former baryte-Pb-Ag-Au-Zn occurrence/mine located in sec. 36, T10N, R1W (SBM), 0.1 km (0.1 mile) SSW of Lead Mountain [2] (coordinates of record), about 9 km ENE of Barstow and SW of Calico (5 miles NW of Yermo), on private (patented) land. The property is comprised of 640 acres. MRDS database stated accuracy for this location is 10 meters. Worked for baryte during the period 1931-1933 with no Pb-Ag production.

Mineralization is hosted in andesite. The ore body is irregular in form, strikes NW, dips 40NE at a Width of 30.48 meters and a length of 396.24 meters. Controls for ore emplacement included a fissure. The vein material is a coarsely crystallized baryte with quartz containing brown iron oxides, Pb carbonate, ochre, manganese oxide and Ag chlorides. Country rock is tuff, limestone and andesitic porphyry. Local rocks include Miocene nonmarine rocks.

Workings include underground openings comprised of a seriers of open cuts and tunnels for a distance of 500 feet. Present workings are confined to a tunnel driven N for 75 feet, crosscutting the ore fissure. Drifts and stoping were excavated above this level. A shaft has been sunk on an incline of 33 degrees for 210 feet, near the portal of the crosscut tunnel. A stope is 25 feet wide by 50 feet long and 30 feet high. At the floor of the stope, there is a vertical winze at 245 feet deep that connects shaft to a tunnel 1,300 feet in length driven from the N.

Mineralization is a baryte vein deposit in metamorphic rocks of Pre-Cretaceous age and sedimentary and volcanic rocks of Tertiary age. The veins follow faults.

Analytical data results: Pb 15-30%, Au $0.40-2.00 (period values)/ton, Ag 6-30 ounces/ton.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

18 valid minerals.

Rock Types Recorded

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Alphabetical List Tree Diagram

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

Pleistocene - Oligocene
0.0117 - 33.9 Ma

ID: 2904462
Miocene nonmarine rocks

Age: Cenozoic (0.0117 - 33.9 Ma)

Stratigraphic Name: Barstow Formation; Bena Gravels; Bissell Formation; Bopesta Formation; Caliente Formation (part); Clews Fanglomerate; Coachella Fanglomerate; Fiss Fanglomerate; Mint Canyon Formation; Oso Canyon Formation; Pickhandle Formation; Punchbowl Formation; San Pablo Group; Santa Barbara Formation; Split Mountain Formation; Tick Canyon Formation; Tropico Group; Valley Springs Formation

Description: Sandstone, shale, conglomerate, and fanglomerate; in part Pliocene and Oligocene.

Lithology: Major:{sandstone,conglomerate}, Minor:{siltstone,mudstone}, Incidental:{sedimentary breccia, limestone, dolostone, felsic volcanic, basalt, chert}

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.


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Tucker, W. Burling (1921), Los Angeles field division: California Mining Bureau Report 17: 334.
Tucker, W. Burling (1924a), San Bernardino County: California Mining Bureau. Report 20: 95, 199-200.
Tucker, W. Burling & Reid J. Sampson (1930), Los Angeles field division: California Journal of Mines and Geology, California Mining Bureau. (Report 26): 26: 298.
Tucker, W. Burling & Reid J. Sampson (1931), Los Angeles Field Division; 27th Report of the State Mineralogist; San Bernardino County: California Journal of Mines and Geology, California Mining Bureau. (Report 27): 27: 351-352, 372.
Erwin, H.D. & D.L. Gardner (1940), Notes on the geology of a portion of the Calico Mountains, San Bernardino County, California: California Division Mines Report 36: 245, 249-250.
Murdoch, Joseph & Robert W. Webb (1942), Notes on some minerals from southern California, III: American Mineralogist: 27: 327.
Tucker, W. Burling & Reid J. Sampson (1943b), Mineral resources of San Bernardino County: California Division Mines Report 39: 484.
Wright, L.A., et al (1953), Mines and mineral deposits of San Bernardino County, California: California Journal of Mines & Geology: 49(1&2): 79 table - tabulated list No. 261, p. 79; No. 395, p. 134, 155.
Durrell, C. (1954), Barite deposits near Barstow, San Bernardino County, California: California Division of Mines Special Report 39: 7-8.
Goodwin, Joseph Grant (1957) Lead and zinc in California. California Journal of Mines and Geology, Division of Mines (Report 53): 53(3&4): 646-647.
Brobst, D.A. (1958), Barite Resources of the United States, USGS Bull. 1072-B: 108 (Table 10).
Gamble, J., and Danehy, E. A. (1959), Geology and Mineral Resources of Township 10 North, Range 1 and 2 West, San Bernardino County, California, San Francisco, Southern Pacific Land Company (unpublished map) No. X-0102-10, scale 1:24,000. In part after Bowen (1954) and McCulloch (1956).
Oesterling, W.A. and Spurck, W.H. (1964), Minerals for Industry, Summary of Geological Survey 1955 - 1961: Vol III - 242 pp., Southern California, Southern Pacific Company, San Francisco, CA 94105: p. 58, No. 56.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 98, 126, 191, 218.
Pemberton, H. Earl (1983), Minerals of California: 195, 233, 514.
Buchanan, L. J. (1987), Precious Metal Deposits in Detachment Terrains, Southeastern California and Western Arizona, in: Johnson, J.L., editor, Bulk Mineable Precious Metal Deposits of the Western United States - Guidebook for Field Trips: Geological Society of Nevada 1987 Symposium: 7.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077227 & 10140678.
U.S. Bureau of Mines (1995), Minerals Availability System/Mineral Industry Location System (MAS/MILS): file #0060710261.
Housley, Robert, private communication to Michael B. Moore.

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