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El Bufalo

Past Producer in Sonora, Mexico with commodities Tungsten, Copper
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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. Ore body information
  11. Economic information about the deposit and operations
  12. Mining district
  13. Ownership information
  14. Production statistics
  15. Reserves and resources
  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 10049056
MRDS ID MX00270
Record type Site
Current site name El Bufalo
Related records 10281200

Geographic coordinates

Geographic coordinates: -109.16811, 28.25025 (WGS84)
Relative position STEEP HILLSIDE NEAR THE HEAD OF ARROYO DEL AGUAJITO, ABOUT 1 KM SW OF SAN NICOLAS.

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 1 KM

Commodities

Commodity Importance
Tungsten Critical Primary
Copper Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Scheelite Ore
Pyrite Gangue
Quartz Gangue

Mineral occurrence model information

Model code 45
USGS model code 15
Deposit model name W pegmatite

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Plutonic Rock > Pegmatite

Nearby scientific data

(1) -109.16811, 28.25025
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Economic information

Ore body information

  • Thickness 10M
    Length 20M
    Width 20M

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1934
Year of first production 1934

Mining district

District name San Nicolas

Ownership information

  • Type Owner
    Owner Ygnacio Garcia
    First year 1945

Production statistics

  • Year 1943
    Period -1943
    Material ORE W
    Accuracy Estimate
    Description Cp_Grade: ^0.5 % Wo3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Wo3 Ore Tungsten Tungsten 1wt-pct

Comments on the production information

  • DIFFICULT TO MINE BY HAND METHODS DUE TO HARDNESS OF GRANITE.

Reserves and resources

  • Type In-situ
    Estimate year 1945
    Commodity Subtype Grade units Group Importance Year
    Tungsten Wo3 0.5 wt-pct Tungsten Major 1945

Comments on the reserve resource information

  • MINERALIZED ROCK WITHIN 5 M OF WORKINGS.

Workings at the site

  • Type of workings Surface
    Overall depth 10M

Comments on the workings information

  • ONE LARGE OPEN CUT AND TWO SMALLER ONES.

Comments on development

  • TWO TONS OF CONC. PRODUCED IN 1934, DERIVED MAINLY FROM SMALL PLACERS ON HILLSIDE BELOW MINE AND IN ADJACENT ARROYO. IN 1942 AND 1943, TWO TONS OF CONC. WAS PRODUCED FROM HAND-SORTED HIGH-GRADE ORE THAT WAS TREATED IN THE OWNER'S ARRASTRE.

Reference information

Bibliographic references

  • Deposit

    WIESE, JOHN H., AND CARDENAS, SALVADOR, 1945, TUNGSTEN DEPOSITS OF THE SOUTHERN PART OF SONORA, MEXICO: USGS BULL 946, P. 103-130

  • Production

    WIESE AND CARDENAS, 1945.

General comments

Subject category Comment text
Deposit SCHEELITE OCCURS IN IRREGULAR STRINGERS AND PODS OF QUARTZ AND AS THIN COATINGS ON JOINT PLANES IN GRANITE. VEINLETS PROBABLY OF PEGMATITIC ORIGIN AND ALSO CONTAIN MINOR PYRITE AND CHALCOPYRITE. NEARLY ALL SCHEELITE FREE OF MO AND CU, BUT SOME CONTAINS A LITTLE CUPROTUGSTITE. STRINGERS GENERALLY LESS THAN 1 M LONG AND 10 CM WIDE AND ARE ARRANGED WITH NO SYSTEMATIC ORIENTATION WITHIN MINERALIZED ZONE 20 SQ M IN AREA, EXPOSED TO A DEPTH OF 10 M BY AN OPEN CUT. ADJACENT HILLSIDE COVERED BY COLLUVIUM.

Reporter information

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