Middlemarch Mine

Past Producer in Cochise county in Arizona, United States with commodities Copper, Zinc, Silver, Gold, Lead, Molybdenum, Tungsten
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. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10037134
MRDS ID M030567
Record type Site
Current site name Middlemarch Mine
Alternate or previous names Missouri
Related records 10185304

Geographic coordinates

Geographic coordinates: -109.94899, 31.87819 (WGS84)
Elevation 1672
Relative position ABOUT 2 MI NW OF BLACK DIAMOND PEAK, 100 M W OF MIDDLEMARCH CANYON

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 12 CENTER Arizona

Comments on the location information

  • INFO FROM LAND.ST :1964

Commodities

Commodity Importance
Copper Primary
Zinc Critical Primary
Silver Primary
Gold Primary
Lead Tertiary
Molybdenum Tertiary
Tungsten Critical Tertiary

Materials information

Materials Type of material
Chalcanthite Ore
Chalcocite Ore
Chalcopyrite Ore
Covellite Ore
Galena Ore
Malachite Ore
Pyrite Ore
Pyrrhotite Ore
Scheelite Ore
Sphalerite Ore
Andradite Gangue
Chlorite Gangue
Epidote Gangue
Grossularite Gangue
Quartz Gangue
Wollastonite Gangue

Alteration

  • (Local) Skarns-Marble; Epidote And Phlogopite-Chlorite Alteration At Fault S-More Intense Hear Faults

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Stronghold Granite
    Rock description Stronghold Granite
    Stratigraphic age (youngest) Tertiary
    Chronological age 25.9
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate
    Rock unit name Bisbee Group
    Rock description Bisbee Group

Economic information

Geologic structures

Type of structure Local
Structure 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

Ore body information

  • General form CHIMNEY, IRREGULAR

Controls for ore emplacement

  • Favorable Carbonate Beds Intersected By Faults; Granite Intrusion F Orming Skarns In Limestone

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

Comments on the production information

  • PLUS A SMALL AMOUNT OF BYPRODUCT SILVER HAS YIELDED ABOUT $85,000

Workings at the site

  • Type of workings Underground
    Length 4572M
    Overall depth 243.84M

Comments on the workings information

  • INCLINED SHAFT AT END OF 250 FT ADIT, 6 LEVELS ON SHAFT WITH DRIF TS AND STOPES. TOTAL LENGTH OF WORKINGS ESTIMATED

Comments on development

  • ORIGINALLY FINANCED IN 1897 BY CHINESE MERCHANTS OF TOMBSTONE & S AN FRANCISCO

Reference information

Bibliographic references

  • Deposit

    SOUSA, 1979, MS THESIS, UNIV OF ARIZ

  • Deposit

    ADMR FILE DATA

  • Deposit

    KEITH, 1973, ABM BULL 187

  • Deposit

    MARVIN ET AL, 1973, USGS BULL 1379

  • Deposit

    DAMON & BIKERMAN, 1964, AZ GEOL SOC DIGEST V.7, P. 63-78

  • Production

    TENNEY, 1929, P.219

General comments

Subject category Comment text
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

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1983 Peterson, Jocelyn A. U.S. Geological Survey

Beyond USGS

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

Authoritative Arizona resources

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