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Standard Mine, Ruona group, Darwin, Darwin District, Darwin Hills, Inyo Co., California, USA

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A former Cu-Pb-Ag mine located in the eastern part of sec. 13, T19S, R40E, MDM, and in the western part of sec. 18, T19S R41E, MDM. The mine and 11 claims were owned by members of the Ruona family (Alex Ruona, Marie Wilson-Ruona and Hilma Ruona). Operated in the 1920's. MRDS database stated accuracy for this location is 10 meters. Updated description and position N36.28799 W117.58093 by Richard Muster based on observations in 2007.

Mineralization is a vein deposit with 2 major veins (Standard vein and the Standard extension vein) and one minor vein (no name), 4 to 50 feet wide. The Standard vein is exposed for about 1,000 feet in the NE part of sec. 13 and strikes N55°E. The Standard Extension vein crops out for about 600 feet in secs. 13 and 18 and strikes N65°E, about 600 feet south of the Standard vein.
The rock is mainly calc-hornfels of the Keeler Canyon formation. The ore occurs as lenses of galena with cerussite and lead-carbonate. Local rocks include Carboniferous marine rocks, unit 2 (SE California Carbonate Assemblage).

The workings include underground openings comprised of of 4 major shafts, 70 and 100 feet deep, 5 adits, about 100 to 200 feet long, several shallow adits and many surface workings. These workings are scattered over an area of about 3000 X 1000 feet. Most work was done in the 1920’s. The Standard vein has been the most developed in the group, at 2 to 6 feet thick.

A small mine camp in the canyon north of Lane Canyon was destroyed by a flash flood before 1934. It probably was located at N36.28978 W117.58866

Workings can be found at :
N36.28799 W117.58571
N36.28801 W117.58396
N36.28670 W117.58047
N36.28796 W117.58781
N36.28893 W117.59019
N36.29258 W117.59010

Mineral List



11 entries listed. 10 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 & Reid J. Sampson (1938), Mineral resources of Inyo County, California: California Journal of Mines and Geology; California Division of Mines (Report 34): 34(4): 455, 559.

Norman, L.A., and Stewart, R.A.(1951), Mines and Mineral Resources of Inyo County, California, California Division of Mines and Geology (Report 47).

Goodwin, Joseph Grant (1957) Lead and zinc in California. California Journal of Mines and Geology, Division of Mines (Report 53): 53(3&4): 514.

Hall, Wayne Everett & E.M. Mackevett (1958), Economic geology of the Darwin quadrangle, Inyo County, California: Calif Division of Mines Special Report 51: 40.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10236116.

Mineral Availability System (MAS) database file # 0060271917.

 
Mineral and/or Locality  
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