El Dorado County is the site of the 1848 gold discovery at Coloma that initiated the great California Gold Rush.
El Dorado County has 2,599 mine records in the USGS MRDS database, making it one of the top mining counties in the nation. Gold mines are the most common mine type, with 2,334 mines being listed with gold as a primary commodity.
Plumas County has eight gold mines that the USGS identifies as significant producers, which is notable given that it is not uncommon for many counties in the West to have no mines considered significant.
El Dorado County contains at least 20 historically important gold mining districts.