USGS Mineral Resources Data System
Type: Historical mine record
Supports:
- mine identity
- development status
- commodities
- underground eligibility evidence
California · Napa County
La Joya
Unconfirmed Mercury Underground
Key facts
- State
- California
- County
- Napa
- Development status
- Past Producer
- Mine type
- Underground
- Primary commodity
- Mercury
- Verification
- Unconfirmed
Mine Location
Approximate AreaDocumented underground workings
Mindat locality description
A former Hg mine located in sec. 24, T7N, R6W (MD), about 7 miles W of Oakville. Owned by Mr. James Doherty. Discovered 1865. Operated 1873, 1915 - 1918, 1929 - 1934, 1936 - 1939, and 1942. Mineralization is hosted in serpentinite. Aphanitic volcani…
Historical mapped workings
USGS historical topographic mapping. Features may no longer exist.
- 1 adit symbol
View individual source records (2)
Every underlying record used to build the summary above, for research/verification use.
- USGS MRDS working type: Underground
- MRDS work_type documents underground workings: Underground · work_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
- Chalcedony
- Pyrite
- Quartz
- Cinnabar
- Mercury
- Chalcedony
- Cinnabar
- Native Mercury
View all 10 reported minerals
- Chalcedony
- Pyrite
- Quartz
- Cinnabar
- Mercury
- Chalcedony
- Cinnabar
- Native Mercury
- Pyrite
- Quartz
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 adit symbols (1)
Historical mapped features may no longer exist.
Mindat
Type: Mineralogical locality database
Record: Mindat Locality: 83676
Supports:
- locality identity
- reported minerals (5)
A Mindat locality match does not by itself establish underground workings.
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