Gold has been recovered from a number of mines in southern Mono County, in the Clover Patch mining district. It includes the areas known as the Chidago and Indian districts. The Blind Spring Hill silver mining district is a few miles to the northeast, and Casa Diablo is to the south. The area was first worked prior to 1900, and a number of mines were worked or prospected again in the 1930s.
The quartz veins, which are as much as 10 feet thick and often brecciated, contain free gold, pyrite, and smaller amounts of other sulfides. In places the ore contained 1/2 to one ounce of gold per ton. Country rock consists of granite, rhyolite, quartzite and limestone.
Casa Diablo, Clover Patch, El Dorado, Evening Star, Gold Crown, Last Chance, Mary B, Sierra Vista, Sour Dough.
Sampson, R. J., and Tutker, W. B., 1940, Mono County, gold: California Div. Mines Rept. 36, pp. 120-140.