USGS Mineral Resources Data System
Type: Historical mine record
Supports:
- mine identity
- development status
- commodities
- underground eligibility evidence
California · Nevada County
Geach Property
Unconfirmed Chromium Underground
Key facts
- State
- California
- County
- Nevada
- Development status
- Past Producer
- Mine type
- Underground
- Primary commodity
- Chromium
- Verification
- Unconfirmed
Mine Location
Approximate AreaDocumented underground workings
Mindat locality description
A former Cr occurrence/mine located in the NW¼ sec. 25, T16N, R8E, MDM, about 2.8 km ENE of Grass Valley proper, E of Hills Flat, ESE of the Sierra Nevada Memorial Hospital, on the N side of Wolf Creek. Operated by C. W. and W. J. Jenkins (lessees). MR…
Historical mapped workings
USGS historical topographic mapping. Features may no longer exist.
- 3 shaft symbols
View individual source records (2)
Every underlying record used to build the summary above, for research/verification use.
- Derived from MRDS oper_type (existing operation): Underground
- MRDS oper_type documents existing underground operation (dev_stat=Past Producer): Underground · oper_type
Verification
Unconfirmed
Source records support underground workings, but UndergroundMines has not yet independently verified this mine.
Why it's listed
USGS source data documents underground workings for this record.
History & operations
Historical record
- Development status: Past Producer
Commodities & minerals
Reported minerals
- Chromite
Access & recent conditions
- Land
- unknown
Community reports
No community field reports yet.
I Visited This MineSources & evidence
USGS Historical Topographic Mine Features
Type: Historical mapped physical features
Dataset: DOI 10.5066/P9TAALR6
Supports:
- mapped shaft symbols (3)
Historical mapped features may no longer exist.
Mindat
Type: Mineralogical locality database
Record: Mindat Locality: 84124
Supports:
- locality identity
- reported minerals (1)
A Mindat locality match does not by itself establish underground workings.
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