USGS Mineral Resources Data System
Type: Historical mine record
Supports:
- mine identity
- development status
- commodities
- underground eligibility evidence
California · San Bernardino County
Afton Canyon
Unconfirmed Manganese Underground
Key facts
- State
- California
- County
- San Bernardino
- Development status
- Past Producer
- Mine type
- Underground
- Primary commodity
- Manganese
- Verification
- Unconfirmed
Also known as
- Cliffside, Van Deventer Mine, Afton Magnesifte Deposit
Mine Location
Approximate AreaDocumented underground workings
Mindat locality description
A former magnesite mine located in sec. 21, T11N, R6E, SBM in Afton Canyon. Mineralization is a bedded magnesite deposit 30 to 75 feet thick which crops out for a distance of 400 to 500 feet in steep canyon walls.
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): Underground
- MRDS oper_type documents existing underground operation (dev_stat=Past Producer): Underground · oper_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
- Magnesite
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: 211198
Supports:
- locality identity
- reported minerals (1)
A Mindat locality match does not by itself establish underground workings.
Related underground mines
Black Mountain
California · San Bernardino County
Unconfirmed Manganese Past Producer
Documented shaft evidence