Black Rock Group

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

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.

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.