Gold Districts of California
Location. Placerville is in west-central El Dorado County. The district includes
the lode mines of the Mother Lode belt, which extends north through the district, and the
placer deposits here and in the adjacent Smith Flat, Diamond Springs, Texas Hill, Coon
Hollow, and White Rock areas.
History. Gold was discovered in the Placerville area in July 1848. The town was
first known as Dry Diggings but had the nickname of Old Hangtown; three robbers were
hanged here on October 17, 1849. From the middle 1850s through the 1870s, the hydraulic
and drift mines in the district were extremely rich. One 20-acre claim at Coon Hollow
yielded $5 million, and the Spanish Hill area yielded $6 million. Quartz mining began in
1852 at the Pacific mine, but the chief period of lode mining was from the 1880s until
about 1915. There was some mining in the district again in the 1930s, but there has been
little activity since. Many of the mines in the district came under the control of the
Placerville Gold Mining Company. The value of the total output for the district is
unknown, but the placer mines are estimated to have yielded at least $25 million.
Geology. A belt of gray to black slate of the Mariposa Formation (Upper
Jurassic) one to two miles wide extends north through the central portion of the district.
Greenstone and amphibolite are to the west, and schist and slate of the Calaveras
Formation (Carboniferous to Permian) and granodiorite lie to the east. The Tertiary South
Fork of the American River, which has numerous tributaries, entered the Placerville basin
from Newtown. In places the Tertiary gravels are overlain by thick beds of rhyolite tuff
Ore Deposits. Of the numerous tributaries of the main Tertiary channel in this
district, probably the best known and one of the richest was the Dee Blue Lead. This
channel extended south from White Rock to Smith's Flat and then west-southwest through the
Texas Hill area. The lode-gold deposits are massive quartz veins as much as 20 feet thick
with numerous parallel stringers. The ore bodies are low to moderate in grade (1/7 to ¼
ounce of gold per ton), but the veins have been mined to depths of 2000 feet. The ore
contains finely disseminated free gold and small amounts of pyrite. The veins occur
chiefly in slate.
Mines. Lode: Elliott, Epley $100,000+, Griffith, Guildford $200,000+, Harmon
$100,000+, Larkin $125,000, Margurite, Oregon $100,000+, Pacific $1,486,000, River Hill,
Sherman $136,000, Superior, True Cons. $100,000, Van Hooker $100,000+. Placer: Coon Hollow
$10 million, Diamond Springs, Green Mountain, Negro Hill, Sacramento Hill, Spanish Hill $6
million, Smith's Flat $2 million+, Texas Hill, White Rock $5 million. Drift: Benfield,
Cedar Spring, Clark, Kumfa, Landecker, Lyon, Pascoe, Rivera, Texas Hill, Try Again, Union.
Excerpt from: Gold Districts of California, by: W.B. Clark, California
Department of Conservation, Division of Mines and Geology, Bulletin 193, 1970.
Return to Principal Gold Districts