USGS Mineral Resources Data System
Type: Historical mine record
Supports:
- mine identity
- development status
- commodities
- underground eligibility evidence
Nevada · Lyon County
Ann Mason Deposit
Unconfirmed Copper Mixed Underground / Surface
Key facts
- State
- Nevada
- County
- Lyon
- Mining district
- Yerington
- Development status
- Prospect
- Mine type
- Mixed underground / surface
- Primary commodity
- Copper
- Verification
- Unconfirmed
Mine Location
Approximate AreaDocumented underground workings
Source classification: Underground operation documented
Specific physical workings are not yet documented in discrete records.
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
Source records document both underground and surface mining.
History & operations
Historical record
- Development status: Prospect
Operators / organizations
- Arimetco International, Inc. · Source-reported owner · 1996
- Tibbles Construction Co. (Don Tibbles) · Source-reported owner · 1985
Commodities & minerals
Reported minerals
- Apatite
- Biotite
- Bornite
- Chalcopyrite
- Feldspar
- Hornblende
- Ilmenite
- Magnetite
View all 12 reported minerals
- Apatite
- Biotite
- Bornite
- Chalcopyrite
- Feldspar
- Hornblende
- Ilmenite
- Magnetite
- Pyrite
- Quartz
- Sphene
- Zircon
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.
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