Underground mines
32
Ophir Mining District
California · 32 underground-eligible mines · USGS MRDS district assignment
Verified
0
Relationship confidence
AUTHORITATIVE (USGS dep_id)
District overview
Mining district documented in USGS MRDS for underground-eligible catalog records.
Major commodities
- Gold
- Copper
Mines in this district
Mollie
California · Placer County
Unconfirmed Gold Past Producer Underground
Moore Mine
California · Placer County
Unconfirmed Gold Past Producer Underground
Historical mapped workings available
Old Pacific
California · Placer County
Unconfirmed Gold Past Producer Underground
Historical mapped workings available
Quinn, Green-Walter, Good Friday Cornvcopia
California · Placer County
Unconfirmed Gold Past Producer Underground
Historical mapped workings available
Razzle Dazzle
California · Placer County
Unconfirmed Gold Past Producer Underground
Spanish
California · Placer County
Unconfirmed Gold Past Producer Underground
Historical mapped workings available
St. Lawrence
California · Placer County
Unconfirmed Gold Past Producer Underground
Documented adit evidence
Three Stars
California · Placer County
Unconfirmed Gold Past Producer Underground
Documented shaft evidence
Related districts
- Grass Valley · 63
- Nevada City · 39
- East Shasta Copper-Zinc · 32
- French Gulch · 24
- New Almaden · 20
- East Mayacmas · 20
- West Shasta Copper-Zinc · 20
- Mother Lode Belt · 19
Sources
- USGS Mineral Resources Data System (MRDS) — District assignment from USGS MRDS Districts table joined by dep_id.
No district boundary polygons are shown. Membership is not inferred from map proximity.