|Latitude & Longitude (WGS84):||36° 32' 20'' North , 117° 47' 20'' West|
|Latitude & Longitude (decimal):||36.53889,-117.78889|
|Köppen climate type:||BWk : Cold desert climate|
A former Ag-Pb-Cu-Zn mine located in secs. 12, 13, 23 & 24, T16S, R38E, MDM, at the site of the former town of Cerro Gordo (mining ghost town), 9.5 km (5.9 miles; 9 road miles) NE of Keeler. The property consisted of 550 acres. MRDS database stated accuracy for this location is 10 meters. This mine resulted from the consolidation of the Union and Santa Maria mines.
Mineralization is a replacement deposit (Mineral occurrence model information: Model code: 72; USGS model code: 19a; Deposit model name: Polymetallic replacement; Mark3 model number: 47), hosted in Late Devonian marble. The ore body is lenticular in form, strikes N-NW and dips 70SW at a width of 6.1 meters and a length of 21.34 meters. The predominant rock is white marble. Slate and igneous rock, with dikes of diorite and porphyry occur within the marble. Three periods of mineralization are recognizable in the mine. The earliest was of pyrite; the second was argentiferous galena and sphalerite with some pyrite; and, the last was quartz with subordinate amounts of galena and argentiferous tetrahedrite. There are 6 ore bodies: China stope, Jefferson Diabase dike, La Despreciada, Union and Belshaw. These formed along steep, N-NW fissures in the Devonian marble. Local rocks include Carboniferous marine rocks, unit 3 (SE California Clastic Assemblage).
Local geologic structures include faults, both pre-intrusive and post-intrusive, pre-mineralization and post-mineralization, some with considerable displacement.
Workings include underground openings with a length of 48,279 meters and an overall depth of 274.32 meters. The greatest vertical dimension of the stopes was about 1,000 feet. The mine was developed by a 900 foot shaft with levels at 85, 200, 400, 550, 700 and 900 feet. A 200 foot deep winze was sunk from the 900 foot level extends to the 1000 and 1100 levels. A second winze was sunk 250 feet and gave access to the 1030 and 1150 levels S of the shaft. Total underground workings are about 30 miles in extent.
During the period 1943 to 1945, the Golden Queen Mining Co. shipped 750 to 1,000 tons of ore, which assayed 17.5% Pb and 13.2 ounces/ton Ag. Total production was estimated to be over $17,000,000 (period values). The recorded production since 1906 is over $6,000,000.
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded from this region.
Mineral ListMineral list contains entries from the region specified including sub-localities
45 valid minerals.
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
66 - 145 Ma
|Mesozoic intrusive rocks|
Age: Cretaceous (66 - 145 Ma)
Lithology: Intrusive igneous rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. 
|Cisuralian - Late Devonian|
272.3 - 382.7 Ma
|Carboniferous marine rocks, unit 3 (SE California Clastic Assemblage)|
Age: Paleozoic (272.3 - 382.7 Ma)
Comments: Southeastern California clastic assemblage (northwestern Death Valley area). Consists primarily of Lower to Upper Mississippian limestone, Upper Mississippian shale, and Pennsylvanian to Lower Permian limestone (turbidite facies).Includes some rocks of Late Devonian age.
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.