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  3. Mineral Resource Data System (MRDS)

La Montana

Past Producer in Sonora, Mexico with commodities Antimony, Silver, Gold
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Production statistics
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10049198
MRDS ID MX00451
Record type Site
Current site name La Montana
Related records 10182480

Geographic coordinates

Geographic coordinates: -112.586, 30.73543 (WGS84)

Site location context

Political divisions (FIPS codes)

Pima(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

Geographic areas

Country State
Mexico Sonora

Comments on the location information

  • ESTIMATE TO WITHIN 0.5 KM.

Commodities

Commodity Importance
Antimony Critical Primary
Silver Secondary
Gold Secondary

Materials information

Materials Type of material
Chalcedony Gangue
Quartz Gangue

Mineral occurrence model information

Model code 180
USGS model code 27d
Deposit model name Simple Sb (veins, pods, etc)

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone
    Stratigraphic age (youngest) Late Triassic
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone

Nearby scientific data

(1) -112.586, 30.73543
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Premineral Fractures: Approx. N 65-90 E, 30-57 S. Postmineral Faults: N 5-42 W, Steep E And W Dips. All Faults Are Of Small Displacement.

Ore body information

  • Strike N 65-90 E
    Dip 30-57 S

Controls for ore emplacement

  • Intersections Of Vein With Premineral Fractures.

Economic information about the deposit and operations

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

Mining district

District name El Antimonio/La Montana

Production statistics

  • Year 1943
    Period -1943
    Material ORE SB
    Accuracy Estimate
    Description Cp_Grade: ^40% Sb
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Antimony Antimony 40wt-pct

Comments on the production information

  • TOTAL PAST PRODUCTION AS OF 1943: BETWEEN 2,000 AND 4,000 TONS OF SHIPPING ORE. SHIPPING ORE REPORTED ELSEWHERE IN PAPER TO BE HAND-SORTED MATERIAL GRADING AT LEAST 40% SB.

Workings at the site

  • Type of workings Underground
    Length 200M
    Overall depth 37M

Comments on the workings information

  • 60 M OF REGULAR WORKINGS ON ONE LEVEL, 22 M BELOW COLLAR OF MAIN SHAFT. ORE BODIES STOPED FOR A DISTANCE OF 140 M. OLD WORKINGS REPORTED TO EXTEND 15 M BELOW MAIN LEVEL WERE FILLED WITH WASTE BY 1943. WATER TABLE ESTIMATED TO BE 15-20 M BELOW LOWEST WORKINGS.

Comments on development

  • FORMERLY ONE OF THE LARGEST PRODUCERS IN THE DISTRICT. IN EARLY 1943, IT PRODUCED ONLY ABOUT 8 TONS OF LOW-GRADE ORE PER DAY. INACTIVE AFTER MAY, 1943.

Reference information

Bibliographic references

  • Deposit

    WHITE, D.E. AND GUIZA, REINALDO, 1949, ANTIMONY DEPOSITS OF EL ANTIMONIO DISTRICT, SONORA, MEXICO: U.S. GEOLOGICAL SURVEY BULLETIN 962-B, P.105-106, PLATES 15, 21

  • Production

    WHITE AND GUIZA, 1949.

General comments

Subject category Comment text
Deposit MAIN VEIN STRIKES N 65 E TO DUE E AND DIPS 30-57 S. ORE BODIES LOCALIZED AT AND BELOW INTERSECTIONS OF VEIN WITH PREMINERAL FRACTURES THAT STRIKE SUBPARALLEL TO THE VEIN BUT DIP MORE STEEPLY TO THE SOUTH. ORE GENERALLY FOUND EXTENDING BELOW INTERSECTIONS FOR SEVERAL METERS ALONG FRACTURES AND FOR 10+ METERS ALONG VEIN. ORE COMPOSED OF ANTIMONY OXIDES IN COARSE-GRAINED QUARTZ. SOME ORE CONTAINING ANTIMONY IN CHALCEDONY GANGUE TYPICAL OF LA PIEDRA AZUL MINE FOUND. AU AND AG VALUES REPORTED.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-DEC-1987 Leonard, Kenneth R. (Page, Norman J.) U.S. Geological Survey

Beyond USGS

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

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