The Black Rock Group is a manganese mine located in Maricopa county, Arizona at an elevation of 2,402 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: 2,402 Feet (732 Meters)
Commodity: Manganese
Lat, Long: 33.73944, -113.17611
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.
Black Rock Group MRDS details
Site Name
Primary: Black Rock Group
Secondary: Black Warrior
Secondary: Black Rock Nos. 1
Secondary: 3
Commodity
Primary: Manganese
Location
State: Arizona
County: Maricopa
District: Aguila District
Land Status
Land ownership: BLM Administrative Area
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/Underground
Ownership
Owner Name: Big Horn Mining Co.
Years: 1960 -
Production
Year: 1954
Time Period: 1952-1954
Description: Cp_Grade: ^30 To 35 Percent Mn
Deposit
Record Type: Site
Operation Category: Past Producer
Deposit Type: Replacement
Operation Type: Unknown
Discovery Year: 1916
Years of Production:
Organization:
Significant: N
Physiography
General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Sonoran Desert
Mineral Deposit Model
Not available
Orebody
Form: WEDGE
Structure
Type: R
Description: Little Horn Peak Fault
Alterations
Not available
Rocks
Name: Gneiss
Role: Associated
Age Type: Associated Rock
Age Young: Neoproterozoic
Name: Gneiss
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous
Name: Gneiss
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Cretaceous
Analytical Data
Not available
Materials
Ore: Pyrolusite
Ore: Psilomelane
Ore: Manganite
Gangue: Calcite
Gangue: Quartz
Comments
Comment (Workings): OPEN PIT, MANY ADITS
Comment (Geology): ORE FOUND IN N-TRENDING FRACTURE ZONES, 2-8 FT WIDE.
Comment (Location): 20 MILES S OF AGUILA. ; INFO FROM LAND.ST :(1978)
Comment (Production): IN 1954 PRODUCTION WAS 250 TONS PER MONTH . UNRECORDED SMALL PRODUCTION PRIOR TO 1952
Comment (Development): OPERATORS INCLUDED: A. R. BUELL,(1952), MOHAVE MINING AND MILLING CO.(1957-1958). PROPERTY CONSISTS OF 3 CLAIMS.
Comment (Deposit): THE ORE BODY IS WEDGE SHAPED AND ROUGHLY L-SHAPED. THE AREA OCCUPIES A DOWN DROPPED FAULT BLOCK.
References
Reference (Deposit): ALLEN, G.B., 1985, ECONOMIC GEOLOGY OF THE BIG HORN MOUNTAINS OF WEST-CENTRAL ARIZONA: ARIZONA BUREAU OF GEOLOGY AND MINERAL TECHNOLOGY OPEN-FILE REPORT 85-17, 140 P.
Reference (Deposit): FARNHAM, L.L, AND STEWART, L.A., 1958, MN DEPOSITS OF WESTERN ARIZONA, U.S.B.M. INFORMATION CIRCULAR 7843.
Reference (Deposit): ADMR BLACK ROCK FILE
Reference (Deposit): USBM-FILE DATA-CLUSTER NUMBER 604-BLACK ROCK MINE
Arizona Gold
"Where to Find Gold in Arizona" 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 Arizona. Read more: Where to Find Gold in Arizona.
