USGS Mineral Resources Data System
Type: Historical mine record
Supports:
- mine identity
- development status
- commodities
- underground eligibility evidence
California · El Dorado County
Pioneer-Lilyama Mine
Unconfirmed Copper Mixed Underground / Surface 1 mapped adit
Key facts
- State
- California
- County
- El Dorado
- Mining district
- Mother Lode Belt
- Development status
- Past Producer
- Mine type
- Mixed underground / surface
- Primary commodity
- Copper
- Verification
- Unconfirmed
Also known as
- Volo., Lilyama Copper and Gold Mine., Little Emma.Lilyama
Mine Location
Approximate AreaDocumented underground workings
-
Adit
— documented in 1 source record.
USGS Historical Topographic Mine Features
Historical mapped workings
USGS historical topographic mapping. Features may no longer exist.
- 1 adit symbol
- Adit : Coloma , 1949
View individual source records (3)
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.
- 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
Operators / organizations
- Morning Star Mining Corp. · Historical operator · 1977
- Lilyama Copper-Gold Mining Co. · Source-reported owner · 1978
Commodities & minerals
Reported minerals
- Bornite
- Calcite
- Chalcopyrite
- Epidote
- Garnet
- Gold
- Hedenbergite
- Hematite
View all 13 reported minerals
- Bornite
- Calcite
- Chalcopyrite
- Epidote
- Garnet
- Gold
- Hedenbergite
- Hematite
- Hornblende
- Magnetite
- Pyrite
- Quartz
- Silver
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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