Location and History
The Beveridge district is in west-central Inyo County in the Inyo Mountains. The area was first worked in the late 1870s, when the Big Horn and Keynote mines were discovered. Mining operations continued fairly steadily until the early 1900s. There was activity in the district again in the 1930s, and there has been intermittent prospecting since.
Geology and Ore Deposits
The region is underlain by a series of northwest-trending beds of limestone, quartzite, and schist that have been intruded by quartz monzonite and other granitic rocks. Quartz veins occur both in the granitic and metamorphic rocks. The veins strike north and usually range from two to eight feet in thickness. The ore contains some free gold, but much of the value is in sulfides, which are abundant in places. Some copper, lead, silver, and zinc have been produced in the district. The greatest depth of development is about 500 feet.
Mines
Big Horn, Burgess, Cinnamon, Golden Eagle, Gold Standard, Keynote 5500,000, Mountain View, Tom Casey.
Bibliography
Jennings. C. W., 1958, Death Valley sheet: California Div. Mines geologic map of California, Olaf P. Jenkins edition.
Tucker, W. B., and Sampson, R. J., 1938, Inyo County gold mines: California Div. Mines Rept. 34, pp. 379-424.
Waring, C. A., 1919, Inyo County, gold mines: California Min. Bur. Rept. 15, pp. 75-85.
