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La Encontrada Mine

Producer in La Paz, Bolivia with commodities Copper, Bentonite
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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. Land status
  15. Ownership information
  16. Production statistics
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10107587
MRDS ID BL10140
Record type Site
Current site name La Encontrada Mine

Geographic coordinates

Geographic coordinates: -68.23284, -17.56433 (WGS84)
Elevation 3827
Relative position W OF CHACARILLA, 193 KM BY ROAD FROM LA PAZ

Site location context

Political divisions (FIPS codes)

La Paz(province)

Bolivia(country)

South America(continent)

Land(continent)

Federal lands

Federal(land status)

Geographic areas

Country State
Bolivia La Paz

Commodities

Commodity Importance
Copper Primary
Bentonite Secondary

Materials information

Materials Type of material
Bentonite Ore
Chalcocite Ore
Malachite Ore

Analytical data

Result GEOBOL ASSAYS: 11.0 TO 12.3% CU OVER 1.1 M
Result BENTONITE IS 85 TO 99% MONTMORILLONITE, REMAINDER QUARTZ, BIOTITE, FE OXIDES

Mineral occurrence model information

Model code 197
USGS model code 30b
Deposit model name Sediment-hosted Cu
Mark3 model number 63

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene

Nearby scientific data

(1) -68.23284, -17.56433
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description On W Flank Of Nw Anticline

Ore body information

  • General form LENTICULAR
    Depth to top 0M

Controls for ore emplacement

  • Preferred Bed (Cu), Tuff Beds (Bentonite)

Economic information about the deposit and operations

Development status Producer
Commodity type Both
Significant No
Discovery year 1956
Discoverer Empresa Embol
Year of first production 1956

Land status

Ownership category Federal

Ownership information

  • Type Owner-Operator
    Owner Empresa Embol

Production statistics

  • Year 1964
    Period 1956-1964
    Material CONS
    Accuracy Accurate
    Description Cp_Grade: ^25% Cu
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Conc. Copper Copper 25wt-pct

Workings at the site

  • Type of workings Underground
    Length 59M

Comments on the workings information

  • ADITS AND SHAFTS. NO WORKINGS ON BENTONITE BEDS.

Reference information

Bibliographic references

  • Deposit

    GUERRA, M., AND ASCARRUNZ K., R., 1964A, INFORME SOBRE EL ESTUDIO DEL YACIMIENTO BENTONITICO MINA LA ENCONTRADA: DEPARTAMENTO NACIONAL DE GEOLOGIA INFORME DNG-M-342, 6P.

  • Deposit

    GUERRA, M., AND ASCARRUNZ K., R., 1964B, INFORME SOBRE ORIENTACION TECNICA MINA CUPRIFERA LA ENCONTRADA: DEPARTAMENTO NACIONAL DE GEOLOGIA INFORME DNG-M-343, 7P., MAP 1:500.

  • Deposit

    GEOLOGICAL INVESTIGATIONS BY GEOBOL (GUERRA AND ASCARRUNZ, 1964A, 1964B

  • Other Database

    CIMRI

  • Production

    GUERRA AND ASCARRUNZ (1964B)

General comments

Subject category Comment text
Deposit CU MINERALIZED MANTOS STRIKE N15 TO 38W DIP 25 TO 32SW. BENTONITE BEDS STRIKE N56E DIP 25NW

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1990 Long, Keith 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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