USGS Mineral Resources Data System
Type: Historical mine record
Supports:
- mine identity
- development status
- commodities
- underground eligibility evidence
California · Mariposa County
Great Northern
Unconfirmed Copper Underground 2 mapped shafts 2 mapped adits
Key facts
- State
- California
- County
- Mariposa
- Development status
- Past Producer
- Mine type
- Underground
- Primary commodity
- Copper
- Verification
- Unconfirmed
Mine Location
Approximate AreaDocumented underground workings
Mindat locality description
A former Cu mine located in secs. 2, 3, 10 & 11, T7S, R17E, MDM, 4.0 km (2.5 miles) SSE of Round Hills (coordinates of record), along Mariposa Creek (1 mile W of the Pocahontas Mine). MRDS database stated accuracy for this location is 1,000 meters. …
Additional documented workings
-
Adit
— documented in 1 source record.
USGS Historical Topographic Mine Features -
Shaft
— documented in 1 source record.
USGS Historical Topographic Mine Features
Historical mapped workings
USGS historical topographic mapping. Features may no longer exist.
- 2 shaft symbols
- 2 adit symbols
- Shaft : Illinois Hill , 1962
- Adit : Illinois Hill , 1962
View individual source records (4)
Every underlying record used to build the summary above, for research/verification use.
-
Adit
Mapped on historical USGS topographic data (Adit). Historical map features may no longer exist in the field. -
Shaft
Mapped on historical USGS topographic data (Mine Shaft). Historical map features may no longer exist in the field.
- 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
- Bornite
- Chalcopyrite
- Pyrite
- Bornite
- Chalcopyrite
- Pyrite
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 (2)
- mapped adit symbols (2)
Historical mapped features may no longer exist.
Mindat
Type: Mineralogical locality database
Record: Mindat Locality: 82192
Supports:
- locality identity
- reported minerals (3)
A Mindat locality match does not by itself establish underground workings.
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Documented adit evidence