ActiveIntermittentNew mineTemporarily idledNon-producingAbandonedHistoric mine (USGS)

Historic gold producers in Larimer County (USGS)

USGS records 18 historic gold producers in Larimer County: 12 past producers and 6 listed as producers or plants. For 13 of them USGS gives an output size (13 small). Production years are recorded for 5 sites, from 1937 to 1955.

Show the 18 sites

Site	USGS status	Output	Commodities	Years
Big Four Mine	Producer	small	Silver, Gold	n/a
Carter Mine	Producer	small	Gold, Silver, Tungsten	n/a
Howes Gulch District	Producer	small	Copper, Gold, Silver	found 1873
Mason Mine	Producer	small	Silver, Tungsten, Gold	n/a
Masonville District	Producer	small	Gold, Silver, Tungsten, Copper, Nickel	to 1955
Rockfield Mine	Past producer	small	Gold, Silver	1937 to 1941
Depression Mine	Past producer	small	Silver, Gold	to 1934
Free Gold Mine	Past producer	small	Gold, Silver, Copper	to 1939
Kelly Mine	Past producer	small	Silver, Gold	n/a
Lone Pine Mine	Past producer	small	Gold	found 1919
Manhattan District	Past producer	small	Gold, Silver, Copper, Zinc, Lead, Uranium	to 1941
Mayesville District	Past producer	small	Uranium, Gold, Silver, Lead, Copper, Beryllium, Mica, Feldspar, Bismuth, REE	n/a
Spring Group	Past producer	small	Uranium, Silver, Gold, Lead	found 1954
Polemic	Plant	n/a	Gold	n/a
Berghof Lode	Past producer	n/a	Gold, Copper, Silver	n/a
Masonville	Past producer	n/a	Tungsten, Gold, Silver	n/a
Mountain State Mill	Past producer	n/a	Gold	n/a
Sodom	Past producer	n/a	Gold, Copper, Lead, Silver, Zinc	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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