The Colombo-Bullion Group is a gold mine located in Sierra county, California at an elevation of 5,000 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.
Name: Colombo-Bullion Group
Elevation: 5,000 Feet (1,524 Meters)
Lat, Long: 39.57889, -120.67528
Map: View on Google Maps
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.
Colombo-Bullion Group MRDS details
Primary: Colombo-Bullion Group
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.
Material type: ORE
Description: Ap_Grade: ^1 Oz/Ton Au, .01 Oz/Ton Ag
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Deposit Size: S
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Comment (Geology): 3 1/2 - 12 FT. THICK BULLION VEIN, SLATE FOOTWALL, DIORITE HANGING WALL, RED OXIDE OF IRON FULL OF QTZ. STRINGES, GOUGE ON BOTH SIDES. 3 PAY SHOOTS. CALIF. VEIN 6 FT. THICK STRIKES E, DIPS 50 N.
Comment (Production): TOTAL OUTPUT TO 1917 WAS $365,000. IN 1939 1200 TONS OF CONCENTRATE YIELDED 1147 OZ. AU & 40 OZ. AG
Comment (Deposit): VEINS, ORE SHOOT
Comment (Workings): 3 ADITS. 1ST 1070 FT. NW ON VEIN. 2ND 180 FT BELOW 1ST. 3RD 130 FT. BELOW.
Comment (Commodity): MIDDLE ADIT VEIN ORE $12/TON
Comment (Location): UTM ACC. SW 1/4 09 STEEP W BANK OF N FORK YUBA RIVER.
Reference (Deposit): MCCULLOCH, W. C., OESTERLING, W. A., SPURCK, W. H., & TISCHLER, M. S., 1964 , MINERALS FOR INDUSTRY, N CALIF.: SO. PACIFIC COMPANY, VOL. 2 , P. 53 .
Reference (Deposit): AVERILL, C. V., 1942 , MINES AND MINERAL RESOURCES OF SIERRA CO.: CDM CALIF. JOUR. MINES AND GEOL., VOL. 38 , NO. 1 , P. 22 , 23 , 53 .
Reference (Deposit): LOGAN, C. A., 1929 , SIERRA CO.: CDMM 25TH REPORT STATE MINERALOGIST, APRIL, P. 162 , 174 .
Reference (Production): MCCULLOCH ETAL, 1964
"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 at Where to Find Gold in California.