USGS Mineral Resources Data System
Type: Historical mine record
Supports:
- mine identity
- development status
- commodities
- underground eligibility evidence
Nevada · Lyon County
Mason Valley Mine
Unconfirmed Copper Underground
Key facts
- State
- Nevada
- County
- Lyon
- Mining district
- Yerington
- Development status
- Past Producer
- Mine type
- Underground
- Primary commodity
- Copper
- Verification
- Unconfirmed
Mine Location
Approximate AreaDocumented underground workings
Mindat locality description
A copper mine that worked on a copper-bearing skarn. Structure: Yerington Batholith Responsible For Dist. Of Metasomatic Rocks And Zoning Of Mineral Assemblages. Qtz. Monzonite Porphyry Dike Swarms Within Central Portion Of Batholith Formed Porphyry C…
Historical mapped workings
USGS historical topographic mapping. Features may no longer exist.
- 17 shaft symbols
- 30 adit symbols
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
- Calcite
- Chlorite
- Garnet
- Chalcocite
- Chalcopyrite
- Malachite
- Actinolite
- Andalusite
View all 35 reported minerals
- Calcite
- Chlorite
- Garnet
- Chalcocite
- Chalcopyrite
- Malachite
- Actinolite
- Andalusite
- Andradite
- Azurite
- Calcite
- Chalcocite
- Chalcopyrite
- Chlorite Group
- commodity:Copper
- commodity:Gold
- commodity:Iron
- commodity:Silver
- Diopside
- Dolomite
- Garnet Group
- Hedenbergite
- Hematite
- Limestone
- Magnetite
- Malachite
- Native Copper
- Orpiment
- Pyrite
- Quartz
- Rhyolite
- Talc
- Tenorite
- Tourmaline
- Tremolite
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 (17)
- mapped adit symbols (30)
Historical mapped features may no longer exist.
Mindat
Type: Mineralogical locality database
Record: Mindat Locality: 15785
Supports:
- locality identity
- reported minerals (29)
A Mindat locality match does not by itself establish underground workings.
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