Lead Mountain Mine (Main Barite Mine), Lead Mountain , Barstow, Barstow District, San Bernardino Co., California, USA
|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  (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 ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
18 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
- Igneous rock
- Sedimentary rock and sediment
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 - Oligocene|
0.0117 - 33.9 Ma
|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
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.