Gold Districts of California
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.
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 prominence, 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 V3 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 5800+ ounces.
Excerpt from: Gold Districts of California, by: W.B. Clark, California
Department of Conservation, Division of Mines and Geology, Bulletin 193, 1970.
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