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Mojave-Rosamond District (Mojave District), Kern Co., California, USA

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A Au-Ag-Cu-Sb-Pb mining district located 5 to 10 miles S to SE of Mojave, in the SE portion of the county.

Location: The Mojave-Rosamond district is in southeastern Kern County. The gold deposits are associated with the five prominent buttes south of the town of Mojave and west and north of the town of Rosamond.

History: Gold was discovered in the Yellow Rover vein on Standard Hill by George Bowers in 1894, and soon afterward other discoveries were made. Activity continued until about 1910 but waned over the next 20 years. The Cactus Queen mine was discovered in 1934, and from 1931 until 1941 mining was done in the district on a major scale. The mines were shut down during World War II, but there has been some activity since. The Tropico mine is now an historical museum and a popular tourist attraction. The district is estimated to have had a total gold and silver output valued at $23 million (period values).

Geology and Ore Deposits: The principal rocks are Tertiary rhyolite, rhyolite porphyry and quartz latite, which are underlain by Mesozoic quartz monzonite. All the ore deposits are associated with the five prominences (fig. 29), the most important of which, both in productivity and in the number of deposits, is Soledad Mountain. The ore occurs in epithermal fissure veins that occupy brecciated and sheared zones in the rhyolitic rocks. The ore contains finely divided gold, with appreciable amounts of silver minerals, including cerargyrite, argentite, and smaller amounts of proustite, pyrargyrite, and electrum. Pyrite, arsenopyrite, galena, and chalcopyrite also are present. The ore shoots range from a few feet to 40 feet in thickness, and are up to 200 feet long. The veins have been developed to depths of 1000 feet. Milling ore usually averaged about β…“ ounce of gold per ton, but some rich ore shoots were worked in the earlier mining operations.

Mines: Burton-Brite-Blank, Cactus, Cactus Queen ($5 million +), Double Eagle, Crescent, Elephant ($200,000 to $400,000), Excelsior, Golden Queen (includes Echo and Gray Edge, Queen Ester and Silver Queen) ($10 million +), Middle Butte ($150,000 +), Milwaukee, Pride of Mojave, Quien Sabe, Standard group (Desert Queen, Exposed Treasure and Yellow Rover) ($3.5 million), Tropico (114,000 ounces), Wegman group (Eureka, Karma and Monarch) ($100,000 +), Western, Whitmore, Winkler, Yellow Dog (5,800 + ounces).

Mineral List

Mineral list contains entries from the region specified including sub-localities


63 entries listed. 43 valid minerals.

Localities in this Region

USA
USA

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References


Bateson, Charles E.W. (1905), The Mojave mining district of California: A.I.M.E. Bulletin 7: 65-82; A.I.M.E. Transactions (1907): 37: 160-177.

Brown, G. Chester (1916a), Kern County: California Mining Bureau. (Report 14): 14: 483.

Tucker, W. Burling (1923), Kern County, Mojave Mining District: California State Mining Bureau 19th Report of the State Mineralogist (Report 19): 156-164.

Tucker, W. Burling & Reid J. Sampson (1933), Gold resources of Kern County: Mojave Mining District, California Mining Bureau. Report 29: 283-284.

Simpson, Edward Cannon (1934), Geology and mineral deposits of the Elizabeth lake quadrangle, California: California Division Mines (Report 30): 30: 371-415.

Tucker, W. Burling (1935), Mining activity at Soledad Mountain and Middle Buttes, Mohave mining district, Kern County: California Journal of Mines and Geology; California Division Mines (Report 31): 31: 465-485.

Tucker, W. Burling, Reid J. Sampson, & Gordon Blaisdell Oakeshott (1949), Mineral resources of Kern County, California: California Journal of Mines and Geology; California Division of Mines (Report 45): 45(2): 220-223.

Troxel, Bennie Wyatt & P.K. Morton (1962), Mines and mineral resources of Kern County, California: California Division Mines & Geology County Report 1, 370 pp.: 43-45, 101, 104, 109, 122, 126, 127, 131, 179.

Dibblee, T.W., Jr. (1963), Geology of the Willow Springs and Rosamond quadrangles, California: USGS Bulletin 1089-C: 141-253.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 124, 300, 354, 363.

Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 159.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 23 (map 2-11), 134, 194.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 545.

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