The Bunker Mine is a chromium mine located in Placer county, California at an elevation of 3,501 feet.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Elevation: 3,501 Feet (1,067 Meters)
Commodity: Chromium
Lat, Long: 39.03722, -120.75861
Map: View on Google Maps
Satelite View
MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.
Bunker Mine MRDS details
Site Name
Primary: Bunker Mine
Secondary: Blue Bird Mine 1880's
Secondary: Bay Tree Prospect
Secondary: Sunnyside Occurrence
Commodity
Primary: Chromium
Location
State: California
County: Placer
District: Forest Hill Divide Area
Land Status
Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Holdings
Not available
Workings
Not available
Ownership
Owner Name: Embree, L. G.
Years: 1942 - 1943
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Year: 1885
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Not available
Orebody
Form: POD
Form: POD
Structure
Type: R
Description: Close Proximity To The Melones Fault Zone
Alterations
Not available
Rocks
Not available
Analytical Data
Analytical Data: CR TO FE RATIO 2.27 TO 1
Analytical Data: 12.23% FE
Analytical Data: ORE AVG. 40.64% CR2O3
Materials
Ore: Chromite
Gangue: Uvarovite
Gangue: Antigorite
Gangue: Chlorite
Gangue: Magnetite
Comments
Comment (Deposit): Discovery Year: 1880'S
Comment (Commodity): ABOVE VALUES FOR ORE SHIPPED 1942-1943
Comment (Location): MINE WORKINGS SCATTERED OVER A LARGE AREA AT THE HEAD OF MAD CANYON DRAINAGE, A SOUTH FLOWING TRIBUTARY OF MIDDLE FORK OF AMERICAN RIVER.
Comment (Workings): WORKINGS CONSISTED OF A 50 FT DEEP SHAFT WITH A SHORT DRIFT AT THE BOTTOM OF THE SHAFT WESTWARD ALONG STRIKE OF THE ORE BODY.
Comment (Geology): DEPOSIT OCCURS IN THE SOUTHERN PART OF A MASS OF ULTRAMAFIC ROCKS THAT INTRUDED PALEOZOIC METAMORPHIC ROCHS OF THE CALAVERAS FORMATION.
Comment (Deposit): CHROMITE BODIES RANDOMLY DISTRIBUTED BUT APPARENTLY CONCENTRATED IN TWO AREAS; CONSISTENTLY HARE THE ABOVE STRIKE; PITCH 70 SE; AND ARE ALIGNED PARALLEL TO THE WELL DEVELOPED SHEARING IN THE PERIDOTITE.
References
Reference (Deposit): RYHEARSON, G.A., 1953, CDMG BULL 134, PT. 3, CHAPT. 5, P. 200, 224-227, 307
Reference (Deposit): STINSON, M.C., 1975, CDMG MINORAL PROPORTY REPORT, UNPUBLISHED
Reference (Production): CDMG BULL 134, PT. 3, CHAPT. 5, P. 226, 227
California Gold
"Where to Find Gold in California" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in California. Read more: Where to Find Gold in California.
