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El Pinalito

Past Producer in Baja California, Mexico with commodity Tungsten
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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. Economic information about the deposit and operations
  12. Mining district
  13. Production statistics
  14. Reserves and resources
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10049029
MRDS ID MX00239
Record type Site
Current site name El Pinalito
Related records 10181425

Geographic coordinates

Geographic coordinates: -116.05082, 32.18342 (WGS84)
Relative position 13 KM SW OF LOS GAVILANES.

Site location context

Political divisions (FIPS codes)

Pima(county)

Arizona(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

San Diego(quadrangle 1:250,000 scale)

Geographic areas

Country State
Mexico Baja California

Comments on the location information

  • ESTIMATE TO WITHIN 1 KM; ESTIMATE MADE FROM DESCRIPTION IN TEXT, NOT SHOWN ON MAP.

Commodities

Commodity Importance
Tungsten Critical Primary

Materials information

Materials Type of material
Scheelite Ore

Analytical data

Result MINED SECTION AVERAGED ONLY 0.2% WO3

Mineral occurrence model information

Model code 42
USGS model code 14a
Deposit model name W skarn

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
  • Host or associated Host
    Rock type Metamorphic Rock > Skarn (Tactite)

Nearby scientific data

(1) -116.05082, 32.18342
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Foliation In Schist Strikes E With Steep N Dip.

Comments on the geologic information

  • SCHEELITE IN BED OF TACTITE AND HORNFELS 3-4 M WIDE, EXTENDS THROUGHOUT A 40 M BY 100+ M ROOF PENDANT COMPOSED MAINLY OF SCHIST, CUT OFF BY QUARTZ DIORITE. DIORITE INTRUDES PENDANT IN AT LEAST TWO PLACES.

Economic information about the deposit and operations

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

Mining district

District name Los Gavilanes

Production statistics

  • Year 1943
    Material ORE W
    Accuracy Estimate
    Description Ap_Grade: ^Ave. 0.83% Wo3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Wo3 Ore Tungsten Tungsten 1wt-pct

Comments on the production information

  • SORTED ORE WAS 1/4 OF ROCK MINED, ALL FROM WESTERNMOST PIT. 15-20 TONS OF ORE AVERAGING 0.7-0.8% WO3 ON DUMPS IN 1943.

Reserves and resources

  • Type In-situ
    Estimate year 1945
    Commodity Subtype Grade units Group Importance Year
    Tungsten Wo3 0.2 wt-pct Tungsten Major 1945

Comments on the reserve resource information

  • AVE. MINING WIDTH: 1.2 M

Comments on the workings information

  • FOUR PITS 1-3 M DEEP.

Reference information

Bibliographic references

  • Deposit

    FRIES, CARL AND SCHMITTER, EDUARDO, 1945, SCHEELITE DEPOSITS IN THE NORTHERN PART OF SIERRA DE JUAREZ NORTHERN TERRITORY LOWER CALIFORNIA, MEXICO: USGS BULL 946-C, P. 73-101

  • Production

    FRIES AND SCHMITTER, 1945, P. 83.

General comments

Subject category Comment text
Deposit SCHEELITE IN TACTITE, ESPECIALLY IN COARSELY CRYSTALLINE VARIETY. MAXIMUM WIDTH OF ORE: 1.0 M.

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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