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Royal group (Spear; Lead Queen; Silver Spear; Cerro Gordo Extension), Cerro Gordo, Cerro Gordo District, Inyo Mts (Inyo Range), Inyo Co., California, USA

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A former Pb-Ag-Zn-Au-Cu mine located in secs. 11, 12, 13 & 14, T16S, R38E, MDM, 0.2 km (0.1 miles) ENE of Cerro Gordo (8 miles E of Keeler). Operated during the period 1909 to 1937. MRDS database stated accuracy for this location is 10 meters.

Mineralization is a vein deposit with 3 parallel veins 1 to 3 feet thick, hosted in limestone. The ore body strikes N30W and dips 70W at a thickness of 0.91 meters. Limestone with a belt of slates occurs on the W slope of the ridge. Diorite porphyry intrusions occur in the limestone, trending NW on the Lead King and Lead Prince claims. The E slope of the ridge is a belt of white marble 300 feet wide. Associated rocks include the diorite. Local rocks include Paleozoic marine rocks, undivided, unit 1 (Mojave Desert and Death Valley area) and/or Carboniferous marine rocks, unit 3 (SE California Clastic Assemblage).

Local geologic structures include: a fault which strikes N and dips 70W.

Workings include underground openings with a length of 320.04 meters and an overall depth of 60.96 meters, and comprised of a 200 foot shaft, 800 feet of drifts and a 50 foot winze on the 200 level.

Total production: $30,000 in Pb, Zn, Ag, Au & Cu (period values). The Pb ore shipped carried 20 to 29% Pb and 26 ounces Ag/ton. It was stated that 46,000 pounds of Zn ore was shipped, averaging 39.2% Zn.

Mineral List



3 entries listed. 3 valid minerals.

The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Tucker, W. Burling (1926), Inyo County: California Journal of Mines and Geology, California Mining Bureau. (Report 22): 22(4): 497-498.

Goodwin, Joseph Grant (1957) Lead and zinc in California. California Journal of Mines and Geology, Division of Mines (Report 53): 53(3&4): 507.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10076643 & 10285333.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060270171.

 
Mineral and/or Locality  
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