MT. Gaines Mine

MT. Gaines Mine is a surface gold mine in Mariposa County, California, near Hornitos. MSHA lists its status as active since Oct 25, 2015 and records 3 employees. It is one of 11 gold mines in California that are not marked abandoned, and the only one in Mariposa County; by employees it ranks 8 of 10 in the state.

Facts

MSHA status
Active since Oct 25, 2015
Type
Surface
County
Mariposa County
State
California
Nearest town
Hornitos
Employees reported
3
Coordinates
37.5, -120.2 (area, generalized for privacy)
MSHA mine ID
0404794

Source: MSHA Mines data set, retrieved 2026-10-13. Status and counts can lag real operations.

Gold mines nearby