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El Pensamiento

Past Producer in Sonora, Mexico with commodities Antimony, 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 10049189
MRDS ID MX00441
Record type Site
Current site name El Pensamiento
Related records 10158187

Geographic coordinates

Geographic coordinates: -112.586, 30.73682 (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
Gold Primary

Materials information

Materials Type of material
Antimony Ore
Gold 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 > Siltstone
    Stratigraphic age (youngest) Late Triassic

Nearby scientific data

(1) -112.586, 30.73682
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Vein Fissure Cut By Numerous Small Postmineral Faults With N To Ne Strikes And Easterly Dips. West Sides Of Faults Have Moved Relatively Southward With Max. Displacement Of 2 M. Some Postmineral Faulting Parallel To The Vein.

Ore body information

  • Thickness 0.06M
    Length 500M
    Width 36M
    Depth to bottom 36M

Controls for ore emplacement

  • Ore Deposition Controlled By Variations In Strike And Dip; Best Ore Where Dip Flattens.

Comments on the geologic information

  • SAME SILTSTONE UNIT AS LA LIMENA AND EL PALO VERDE VEINS TO THE WEST.

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
    Ore Antimony Antimony 40wt-pct

Comments on the production information

  • PAST PRODUCTION AS OF 1943 ESTIMATED AT BETWEEN 1,000 AND 2,000 TONS OF SHIPPING ORE. SHIPPING ORE DESCRIBED AS HAND-SORTED MATERIAL GRADING AT LEAST 40% SB.

Comments on the reserve resource information

  • 1943 ASSESSMENT CONCLUDED THAT MINE CONTAINED LARGE QUANTITIES OF LOW-GRADE ORE AND PROBABLY ALSO SOME UNDISCOVERED HIGH-GRADE ORE BODIES.

Workings at the site

  • Type of workings Underground
    Length 360M
    Overall depth 36M

Comments on the workings information

  • 360 M OF DRIFTS ALONG 250 M LENGTH OF VEIN, WORKED TO A MAX. DEPTH OF 36 M. TWO MAIN LEVELS AT 11.5 AND 23 M BELOW SURFACE. INTERMEDIATE LEVEL AT 18 M. MAIN SHAFT INCLINED 50 DEGREES WITH VERTICAL DEPTH OF 30 M. WATER TABLE ESTIMATED TO BE 20 M BELOW LOWEST WORKINGS.

Comments on development

  • MINOR ACTIVITY AT EAST END OF VEIN IN 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.103-104, PLATES 15, 19

  • Production

    WHITE AND GUIZA, 1949.

General comments

Subject category Comment text
Deposit WIDEST AND MOST PERSISTENT VEIN IN DISTRICT. KNOWN STRIKE LENGTH: 250 M. PROBABLE TOTAL STRIKE LENGTH OF 500 M. AVERAGE WIDTH: 60 CM. VEIN CONSISTS OF COARSE-GRAINED MILKY QUARTZ CONTAINING ANTIMONY OXIDE. AVERAGE RECORDED DIPS ON THE THREE MINE LEVELS, FROM UPPER TO LOWER: 68, 74, AND 64 DEGREES. THREE LARGEST ORE BODIES SITUATED ALONG PORTIONS OF THE VEIN WHERE DIP FLATTENS OUT. DIP CHANGES CORRESPONDING TO THESE ORE BODIES ARE: CHANGE FROM 88 N ON INTERMEDIATE LEVEL TO 75 S AT THE SURFACE; FLATTENING OF DIP FROM 72 ON THE MIDDLE PART OF THE LOWER LEVEL TO 66 AT A DISTANCE OF 6 M BELOW THE LEVEL; DIP CHANGE FROM 53 IN THE UPPER PART OF THE LOWER LEVEL STOPE TO 43 IN THE MIDDLE AND 55 IN THE LOWEST PORTION. MAX. WIDTH OF VEIN IN STOPE: 1.8 M. ABOUT 35 CM OF ORE GENERALLY FOUND ALONG HANGING WALL, AND 10-20 CM IN THE MIDDLE AND FOOTWALL PORTIONS OF THE VEIN. MUCH OF THE QUARTZ IS GOLD-BEARING.

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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