Commonwealth Extension Mine

The Commonwealth Extension Mine is a gold and silver mine located in Cochise county, Arizona at an elevation of 4,400 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: Commonwealth Extension Mine

Commodity

Primary: Gold
Primary: Silver
Secondary: Copper

Location

State: Arizona
County: Cochise
District: Pearce District

Land Status

Land ownership: Private
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: Commonwealth Extension Mining Co

Production

Not available

Deposit

Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Intermontane Plateaus
Physiographic Province: Basin And Range Province
Physiographic Section: Mexican Highland

Mineral Deposit Model

Not available

Orebody

Form: VEINS

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Silicification

Rocks

Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Name: Rhyolite
Role: Associated
Age Type: Host Rock
Age Young: Pliocene

Analytical Data

Not available

Materials

Not available

Comments

Comment (Deposit): SEE COMMONWEALTH FINE FOR MAJOR PRODUCER ADJOINING COMMONWEALTH EXTENSION ; INFO.SRC : 1 PUB LIT

Comment (Production): PRODUCTION INCLUDED UNDER COMMONWEALTH IN ABGMT-USBM FILES

Comment (Deposit): SPOTTY OXIDIZED SILVER-GOLD MINERALIZATION IN FISSURE VEINS AND NARROW REPLACEMENT BODIES IN ALTERED ANDESITE AND RHYOLITE BRECCIA.

Comment (Workings): SHAFT WORKINGS CONNECTED TO AND EAST OF COMMONWEALTH MINE, SEE COMMONWEALTH FOR COMPLETE DESCRIPTION

References

Reference (Deposit): KEITH, S.B., 1973, ARIZONA BUREAU OF MINES BULLETIN 187, P. 69.

Reference (Deposit): SAWYER, M.B., GURMENDI, A.C., DALEY, M.R., AND HOWELL, S.B., 1992, PRINCIPAL DEPOSITS OF STRATEGIC AND CRITICAL MINERALS IN ARIZONA: UNITED STATS BUREAU OF MINES SPECIAL PUBLICATION, 334 P.

Reference (Other Database): CIMRI

Reference (Production): KEITH, 1973.

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.