ActiveIntermittentNew mineTemporarily idledNon-producingAbandonedHistoric mine (USGS)

Historic gold producers in San Luis Obispo County (USGS)

USGS records 13 historic gold producers in San Luis Obispo County: 10 past producers and 3 listed as producers or plants. For 4 of them USGS gives an output size (4 small).

Show the 13 sites

Site	USGS status	Output	Commodities	Years
Barneberg Mine	Producer	small	Manganese, Iron, Gold, Silver, Mercury	n/a
Los Osos	Past producer	small	Copper, Silver, Gold, Cobalt, Nickel	n/a
Los Osos Mine	Past producer	small	Copper, Gold, Sand and Gravel, Construction	n/a
San Ramon	Past producer	small	Copper, Gold, Silver	n/a
Queen Bee Mine	Producer	n/a	Gold	n/a
Still Ranch Property	Producer	n/a	Gold	n/a
Jehovah Jireh Placer	Past producer	n/a	Gold	n/a
Last Chance	Past producer	n/a	Gold	n/a
Los Osos Mine	Past producer	n/a	Copper, Gold, Silver	n/a
O.S. Still Ranch Property	Past producer	n/a	Gold	n/a
Oro Fino	Past producer	n/a	Gold, Silver	n/a
Queen Bee Mine	Past producer	n/a	Gold	n/a
San Ramon Nos. 1, 2, 3, & 4	Past producer	n/a	Copper, Gold	n/a

Source: USGS Mineral Resources Data System (retrieved 2026-10-13). The database was last updated around 2011, positions can be approximate and "producer" does not mean a mine is operating today. Sites already matched to an MSHA record are shown in the MSHA tables.

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