The Holbrook and Mcguire Mine is a mine located in Calaveras county, California at an elevation of 1,299 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: 1,299 Feet (396 Meters)
Commodity:
Lat, Long: 37.9603, -120.56310
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.
Holbrook and Mcguire Mine MRDS details
Site Name
Primary: Holbrook and Mcguire Mine
Secondary: Holbrook and Mcguire Group
Secondary: High Grade Workings
Secondary: Low Grade Workings
Commodity
Tertiary: Chromium
Tertiary: Iron
Location
State: California
County: Calaveras
District: Carson Hill
Land Status
Land ownership: Federal
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
Type: Surface
Ownership
Owner Name: U.S. Bureau Of Land Management - Sacramento Office
Percent: 100.0
Home Office: California
Info Year: 1976
Owner Name: Dunbar, Allan - Last Operator
Home Office: California
Info Year: 1976
Years: 1942 -
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Surface-Underground
Mining Method: Unknown
Year First Production: 1918
Discovery Year: 1890
Years of Production:
Organization:
Significant: N
Physiography
General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Unknown: Chromite
Unknown: Magnesite
Unknown: Serpentine
Comments
Comment (Production): PRODUCTION TO 1918,600 TONS 40-48% CR2O3, 250 TONS AFTER 191 850 TONS. U.SBM ASSAY-SAMPLE#T- 1761,USBM#71811 YIELDED 38. 3 LAND OWNED BY BUREAU OF LAND MANAGEMENT,SACRAMENTO,CAL. ORE EXPOSED IN LOW GRADE WORKINGSMAY CONTAIN UP TO 600 TONS, GS GRADE ORE INADEQUATE RESOURCE FOR COST ANALYSIS ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES-MASSIVE 2 03.32,CR2O3 46.60,FEO 10.61,TOTAL FE 12.07,AL203 18.89,MGO CR/FE 3.40.DISSEMINATED ORE=S102 02.50,CR2O3 46.04,FEO 11.43 FE 14.15,AL203 22.67,MGO 13.60,CR/FE 2.86.OLD MILL CONCENTRA 05.00,CR2O3 45.31,FEO 09.45,TOTALFE 19.94,AL203 16.06,MGO 09 FE=2.
References
Reference (Deposit): CAL. DIV. MINES GEOL BULL 134,PT3CHAP 2,P.42-44,PL.5
Reference (Deposit): CAL DIV MINES GEOL BULL 145,PL 2
Reference (Deposit): CAL. COUNTY REPT NO.2,P.22,129,& PL.D 1962
Reference (Deposit): COOP WAR MINERALS INVEST. PROJ, CALAVERAS COUNTY NO.6&7, 19
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.
