USGS Mineral Resources Data System
Type: Historical mine record
Supports:
- mine identity
- development status
- commodities
- underground eligibility evidence
California · El Dorado County
Helemar
Unconfirmed Chromium Mixed Underground / Surface
Key facts
- State
- California
- County
- El Dorado
- Development status
- Past Producer
- Mine type
- Mixed underground / surface
- Primary commodity
- Chromium
- Verification
- Unconfirmed
Mine Location
Approximate AreaDocumented underground workings
Mindat locality description
A Cr occurrence located in the NW¼ sec. 30, T8N, R10E, MDM, about 7 km (about 5 miles) ESE of Latrobe, N of the Cosumnes River E of Clark Creek. MRDS database stated accuracy for this location is 500 meters. Operated by Theresa Garibaldi. Operated duri…
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): Surface-Underground
- MRDS oper_type documents existing underground operation (dev_stat=Past Producer): Surface-Underground · oper_type
Verification
Unconfirmed
Source records support underground workings, but UndergroundMines has not yet independently verified this mine.
Why it's listed
Source records document both underground and surface mining.
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
Mindat
Type: Mineralogical locality database
Record: Mindat Locality: 77711
Supports:
- locality identity
- reported minerals (1)
A Mindat locality match does not by itself establish underground workings.
Related underground mines
Darrington Mine
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Documented adit evidence
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Unconfirmed Chromium Past Producer
Historical mapped workings available