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Cerro De San Francisco

Past Producer in Sonora, Mexico with commodity Antimony
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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 10049065
MRDS ID MX00281
Record type Site
Current site name Cerro De San Francisco
Related records 10206131

Geographic coordinates

Geographic coordinates: -112.58739, 30.76348 (WGS84)
Relative position 2.5 KM N OF EL ANTIMONIO, NEXT TO THE VILLAGE OF CERRO DE SAN FRANCISCO.

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

Materials information

Materials Type of material
Antimony Ore
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 Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Stratigraphic age (youngest) Late Triassic
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Trachyte
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Trachyte

Nearby scientific data

(1) -112.58739, 30.76348
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Major Thrust Fault: Strike- Approx. Due N, Dip- Approx. 40 E.

Ore body information

  • General form BRECCIA
    Strike 1>N 0-10 E, 2>N 35 E
    Dip 1>35-50 E, 2>40-60 E
    Thickness 1M
    Length 100M
    Width 15M
    Depth to bottom 15M

Controls for ore emplacement

  • Best Ore Found In More Flatly Dipping Parts Of Vein.

Comments on the geologic information

  • COUNTRY ROCK CONSISTS OF UPPER BEDS OF PERMIAN LIMESTONE THAT HAVE BEEN THRUST UPON RED CALCAREOUS SANDSTONE OF TRIASSIC AGE. THRUST FAULT IN CERRO DE SAN FRANCISCO AREA STRIKES APPROX. DUE NORTH AND DIPS ABOUT 40 E. TOTAL DISPLACEMENT ESTIMATED TO BE 20 TO 100 M. AFTER MAJOR MOVEMENT, DIKES OF FINE-GRAINED DIORITE AND TRACHYTE WERE INTRUDED ALONG AND ACROSS THE EARLY FAULT PLANE. ANTIMONY ORE WAS DEPOSITED IN LATER FAULT PLANE AFTER A SECOND PERIOD OF THRUST MOVEMENT. MINERALIZED PART OF THE EARLY FAULT IS RESTRICTED TO THE TRACHYTE AND DOES NOT EXTEND INTO EITHER THE FINE-GRAINED DIORITE OR THE PARTS OF THE EARLY THRUST THAT DO NOT CONTAIN IGNEOUS ROCKS.

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/Cerro De San Francisco

Production statistics

  • Year 1935
    Period 1925-1935
    Material ORE SB
    Accuracy Estimate
    Description Cp_Grade: ^5 - 10 % Sb
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Antimony Antimony 8wt-pct

Comments on the production information

  • MOSTLY HIGH-GRADE ORE TAKEN FROM TWO MAIN VEINS. ESTIMATE IS BETWEEN 8,000 TO 10,000 METRIC TONNES.

Workings at the site

  • Type of workings Underground
    Overall depth 15M

Comments on the workings information

  • WORKINGS EXCLUSIVELY IN VEINS.

Comments on development

  • PRODUCTION YEARS: 1925-1935.

Reference information

Bibliographic references

  • Deposit

    GUIZA, REINALDO, Y WHITE, DONALD E., 1949, LOS YACIMIENTOS DE LA REGION DE EL ANTIMONIO, ESTADO DE SONORA: INST. NACIONAL PARA LA INVESTIGACION DE RECURSOS MINERALES, BOLETIN 23, 47 P.

  • Deposit

    WHITE, D.E. AND GUIZA, REINALDO, 1949, ANTIMONY DEPOSITS OF EL ANTIMONIO DISTRICT, SONORA, MEXICO: U.S. GEOLOGICAL SURVEY BULLETIN 962-B, P.96-97, PLATE 13.

  • Production

    GUIZA AND WHITE, 1949.

General comments

Subject category Comment text
Deposit TWO VEINS ABOUT 200 M APART. EASTERN VEIN OCCUPIES THRUST FAULT THAT CUTS A TRACHYTE DIKE INJECTED ALONG EARLIER THRUST WITH RELATIVELY LARGE DISPLACEMENT. THE THRUST FAULTS STRIKE FROM DUE N TO N 10 E AND DIP 35 TO 50 E. VEIN CONSISTS OF STRINGERS OF QUARTZ AND ANTIMONY OXIDE FILLING BRECCIA ZONE UP TO 1 M WIDE, AND ABOUT 100 M LONG. VEIN WORKED DOWN-DIP TO A MAX. DEPTH OF 15 M (AS OF 1943). WESTERN VEIN: 70 M LONG IN SANDSTONE AND DIORITE, STRIKES N 35 E AND DIPS 40-60 E. (BEDDING IN SANDSTONE STRIKES N 10 W AND DIPS 55-75 W.) 10 CM TO 1 M WIDE, WORKED TO A DEPTH OF 8 M. TOTAL PRODUCTION FROM BOTH ORE BODIES SMALL.

Reporter information

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

Beyond USGS

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

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