Colosseum Rare Metals Inc.

Colosseum Rare Metals Inc. is a surface gold mine in San Bernardino County, California, near Nipton. MSHA lists its status as intermittent since Jun 1, 2026 and records 6 employees. It is one of 11 gold mines in California that are not marked abandoned, and one of 2 in San Bernardino County; by employees it ranks 6 of 10 in the state.

Facts

MSHA status
Intermittent since Jun 1, 2026
Type
Surface
County
San Bernardino County
State
California
Land status (BLM data)
Land status not determined in the BLM dataset
Nearest town
Nipton
Employees reported
6
Operator
Colosseum Rare Metals Inc.
Coordinates
35.4697, -115.5339
MSHA mine ID
0404559

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

Land status comes from the BLM Surface Management Agency dataset and can be out of date. Check ownership before you go near any mine site.

History and geology (USGS)

USGS site name
Mountain Pass Mine and Mill
USGS status
Past producer
Commodities
Gold, REE, Cerium, Silver, Lead
Deposit type
Carbonatite
Workings
Surface
Production years
1951 to 2002
Discovered
1949

Matched by location to the USGS Mineral Resources Data System record 10212814 (retrieved 2026-10-13). The database was last updated around 2011, so history may be out of date.

Gold mines nearby