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Cobre Loma Mine

Past Producer in Cochise county in Arizona, United States with commodities Copper, Zinc, Silver
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Ownership information
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10104061
MRDS ID M241057
Record type Site
Current site name Cobre Loma Mine
Related records 10161238

Geographic coordinates

Geographic coordinates: -109.96316, 31.88985 (WGS84)
Elevation 1768
Relative position APPROX 11 MI NW OF COURTLAND

Site location context

Political divisions (FIPS codes)

Cochise(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Cochise Stronghold(quadrangle 1:24,000 scale)

Chiricahua Peak(quadrangle 1:100,000 scale)

Douglas(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Willcox Playa(hydrologic unit)

San Pedro-Willcox(hydrologic accounting unit)

Middle Gila(hydrologic subregion)

Lower Colorado(hydrologic region)

Federal lands

Coronado National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States Arizona Cochise

Public Land Survey System information

Meridian Township Range Section Fraction State
Gila and Salt River 018S 023E 02,11 Arizona

Comments on the location information

  • SE 1/4 SEC 2, NE 1/4 SEC 11, UTM ACC

Commodities

Commodity Importance
Copper Primary
Zinc Critical Primary
Silver Primary

Materials information

Materials Type of material
Bornite Ore
Chalcopyrite Ore
Pyrite Ore
Sphalerite Ore

Alteration

  • (Local) Pyrometasomatic Tactite Zone

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Metamorphic Rock > Hornfels
    Rock unit name Bisbee Group
    Rock description Bisbee Group

Nearby scientific data

(1) -109.96316, 31.88985
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Contact Between Limy Hornfels And Porphyritic Intrusive East Dipping, Nw Trending Thrust Sheets. Steep Dipping To Overturned Cretaceous Beds, At This Mine, Fault Is Cobra Loma Thrust Fault, And Cretaceous Beds Dip 30-60 Sw In The Area Ne Of Thrust

Comments on the geologic information

  • PYROMETASOMATIC TACTITE ZONE IN LIMY HORNFELS ALONG CONTACT WITH PORPHYRITIC INTRUSIVE. PORPHYRITIC INTRUSIVE IS MAPPED AS RHYOLITE BY SOUSA, 1980

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Middle Pass District

Land status

Ownership category National Forest

Ownership information

  • Type Operator
    Owner Cobre Loma Copper Co, Middlemarch Copper Co, Arizona Middlemarch Topper Co

Comments on the production information

  • PROBABLY UP TO 5,000 TONS OF ORE PRODUCED FROM 1915 TO 1920.

Comments on the workings information

  • TUNNEL WORKINGS.

Reference information

Bibliographic references

  • Deposit

    KEITH, S B, 1973, ARIZONA BUREAU OF MINES BULLETIN 187, P 68.

  • Deposit

    F.X. SOUSA, 1980, M.S. THESIS, UNIV. OF ARIZ.

  • Production

    KEITH, 1973, ARIZ BUR OF MINES BULL 187.

General comments

Subject category Comment text
Deposit ORE IN A PYROMETASOMATIC TACTITE ZONE IN LIMY HORNFELS ALONG THE CONTACT WITH A PORPHYRITIC INTRUSIVE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1980 Zigler, Jan L. U.S. Geological Survey
Updater 01-DEC-1981 Gest, Don E. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

External references

Maps centered on this site

Authoritative Arizona resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.