Middlemarch Mine

The Middlemarch Mine is a gold, silver, copper, and zinc mine located in Cochise county, Arizona at an elevation of 5,486 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: Middlemarch Mine
Secondary: Missouri

Commodity

Primary: Gold
Primary: Silver
Primary: Copper
Primary: Zinc
Tertiary: Lead
Tertiary: Molybdenum
Tertiary: Tungsten

Location

State: Arizona
County: Cochise
District: Middle Pass District

Land Status

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.

Holdings

Not available

Workings

Type: Underground

Ownership

Not available

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: CHIMNEY, IRREGULAR

Structure

Type: L
Description: Hinge Zone Of Nw Trending Fold, W Limb Cut Off By Sw Dipping Rever Se Fault (Red Ant) Which Juxta Poses Prec Cochise Peak Quartz Monzonit E Against Bisbee Group; Nw Trending Rhyolite Dike To Ne

Alterations

Alteration Type: L
Alteration Text: Skarns-Marble; Epidote And Phlogopite-Chlorite Alteration At Fault S-More Intense Hear Faults

Rocks

Name: Rhyolite
Role: Associated
Age Type: Associated Rock Unit
Age in Years: 25.900000+-
Age Young: Tertiary

Name: Rhyolite
Role: Associated
Age Type: Host Rock Unit
Age Young: Late Cretaceous

Name: Rhyolite
Role: Associated
Age Type: Host Rock
Age Young: Late Cretaceous

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Malachite
Ore: Covellite
Ore: Chalcocite
Ore: Scheelite
Ore: Pyrrhotite
Ore: Galena
Ore: Sphalerite
Ore: Pyrite
Ore: Chalcanthite
Gangue: Quartz
Gangue: Chlorite
Gangue: Andradite
Gangue: Wollastonite
Gangue: Grossularite
Gangue: Epidote

Comments

Comment (Development): ORIGINALLY FINANCED IN 1897 BY CHINESE MERCHANTS OF TOMBSTONE & S AN FRANCISCO

Comment (Workings): INCLINED SHAFT AT END OF 250 FT ADIT, 6 LEVELS ON SHAFT WITH DRIF TS AND STOPES. TOTAL LENGTH OF WORKINGS ESTIMATED

Comment (Deposit): THIS REPORT WAS TAKEN FROM RECORD M030567 OF JAN WILT IN MOLYBDENU M FILE, CONTACT PERSON T.G. THEODORE, USGS ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT

Comment (Location): INFO FROM LAND.ST :1964

Comment (Production): PLUS A SMALL AMOUNT OF BYPRODUCT SILVER HAS YIELDED ABOUT $85,000

References

Reference (Deposit): ADMR FILE DATA

Reference (Deposit): KEITH, 1973, ABM BULL 187

Reference (Deposit): MARVIN ET AL, 1973, USGS BULL 1379

Reference (Deposit): DAMON & BIKERMAN, 1964, AZ GEOL SOC DIGEST V.7, P. 63-78

Reference (Production): TENNEY, 1929, P.219

Reference (Deposit): SOUSA, 1979, MS THESIS, UNIV OF ARIZ

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.