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  3. Mineral Resource Data System (MRDS)

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. Economic information about the deposit and operations
  13. Mining district
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10048958
MRDS ID MX00146
Record type Site
Current site name San Francisco
Related records 10303953

Geographic coordinates

Geographic coordinates: -112.58961, 30.77709 (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

Materials information

Materials Type of material
Antimony Ore
Stibnite Ore

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 > Sandstone

Nearby scientific data

(1) -112.58961, 30.77709
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Economic information

Geologic structures

Type of structure Local
Structure description Vein(S) Subparallel To Bedding.

Ore body information

  • Strike N 45-70 E
    Dip 85 N TO 85 S
    Thickness 3M
    Length 200M

Comments on the geologic information

  • NO IGNEOUS INTRUSIONS CROP OUT NEAR THE MINE. SEDIMENTARY ROCKS NEAR THE W END OF THE DEPOSIT MAY BE OF VOLCANIC ORIGIN, BUT THEY ARE OLDER THAN THE VEINS. AREA LARGELY COVERED BY ALLUVIUM.

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/San Francisco

Workings at the site

  • Type of workings Underground
    Overall depth 40M

Comments on the workings information

  • 35 M MAIN SHAFT WITH THREE LEVELS AT DEPTHS OF 13 M, 25 M, AND 31 M. WATER LEVEL IN 1943 WAS ONLY 10 M BELOW THE SURFACE. LOWEST WORKINGS FAR BELOW WATER TABLE.

Comments on development

  • ONE OF THE MOST PRODUCTIVE MINES IN THE DISTRICT FROM ABOUT 1925-1935. INACTIVE IN 1943.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit ONLY MINE IN THE DISTRICT WHERE AN APPRECIABLE AMOUNT OF STIBNITE WAS FOUND. ; INFO.SRC : 1 PUB
Deposit SB VEIN DEPOSIT, EITHER TWO SEPARATE VEINS OR SINGLE VEIN WITH 12 M OFFSET NEAR CENTRAL PART. KNOWN STRIKE LENGTH: 200 M. VEIN STRIKES N 45-70 E. ON THE WEST SIDE OF ARROYO, VEIN DIPS 85 N AND CONSISTS OF 30 CM OF BRECCIATED AND ALTERED WALL ROCK WITH ABOUT 10 CM OF LOW-GRADE SB ORE ALONG HANGING WALL. VEIN DIPS 75-85 S ON EAST SIDE OF ARROYO. IN THE MIDDLE AND LOWER PARTS OF THE DEPOSIT, THE DIP OF THE VEIN FLATTENS TO THE N AND ORE SAID TO BE 3 M WIDE ALONG LARGE PART OF THE VEIN. ORE MOSTLY OXIDIZED TO DEEPEST LEVELS OF THE MINE, BUT ABOUT 4 TONS OF UNOXIDIZED STIBNITE ORE WAS MINED FROM BELOW THE SECOND LEVEL. VEIN WAS MINED TO A DEPTH OF 35-40 M.

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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