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Enramada

Past Producer in La Paz, Bolivia with commodities Tin, 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. Nearby scientific data
  8. Ore body information
  9. Economic information about the deposit and operations
  10. Mining district
  11. Mineral rights holdings
  12. Land status
  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 10207030
MAS/MILS ID 3350200059
Record type Site
Current site name Enramada

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -67.7828, -16.3477 (WGS84)
Elevation 3000
Location accuracy 10(meters)

Site location context

Political divisions (FIPS codes)

La Paz(province)

Bolivia(country)

South America(continent)

Land(continent)

Geographic areas

Country State
Bolivia La Paz

Commodities

Commodity Importance
Tin Critical Secondary
Tungsten Critical Primary

Materials information

Materials Type of material
Arsenopyrite Unknown
Cassiterite Unknown
Fluorite Unknown
Muscovite Unknown
Pyrite Unknown
Pyrrhotite Unknown
Sphalerite Unknown
Tourmaline Unknown
Wolframite Unknown
Wolframite Unknown

Nearby scientific data

Main Entrance (1) -67.7828, -16.3477
ListMap

Economic information

Ore body information

  • Length 800M
    Width 300M
    Depth to top 300M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 STOCKWORK
    Shape of Orebody #1 OTHER
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control IGNEOUS
    Secondary Ore Control FOLDING
    Degree of Wallrock Alter. UNKNOWN
    Type of Wallrock Alter. #1 UNKNOWN
    Date of Last Modification 820729
  • Strike N35W
    Dip 55W
    Area 10HA
    Field Value
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 TABULAR
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control FOLDING
    Secondary Ore Control FAULTING
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 PYRITIZATION
    Type of Wallrock Alter. #2 SILICIFICATION
    Strike And Dip N35W:55W
    Minimum Depth to Top 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 10
    Date of Last Modification 830909

Comments on the geologic information

  • THERE ARE MORE THAN 20 MINERALIZED VEINS OF WHICH 14 ARE IMPORTANT, VARYING IN WIDTH BETWEEN 1 CM AND 1 M, WITH AN AVERAGE OF 70 CM.

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Significant Yes
Mining method Open Stope - Overhand
Year of first production 1912
Milling method Gravity

Mining district

District name Yanacachi Mining District

Mineral rights holdings

Type of mineral rights Unknown

Land status

Ownership category State

Ownership information

  • Type Owner-Operator
    Owner Imco International Mining Co.
    Interest 100
    Year 1981

Production statistics

  • Year 1980
    Description International Mining Company Acquired 80000 Mt Ore/Yr
  • Year 1981
    Description Enramada In 1973. Progressive Expansion 140000 Mt Ore/Yr
  • Year 1982
    Description Is Projected Through 1990. In 1981, 140, 150000 Mt Ore/Yr

Reserves and resources

  • Type In-situ
    Estimate year 1981
    Total resources 349068mt ore
    Commodity Subtype Grade units Group Importance Year
    Tungsten Wo3 1.08 wt-pct Tungsten Major 1981
    Tin Sn 0.03 wt-pct Tin Minor 1981
  • Type In-situ
    Estimate year 1981
    Total resources 392170mt ore
    Commodity Subtype Grade units Group Importance Year
    Tungsten Wo3 0.3799 wt-pct Tungsten Major 1981
    Tin Sn 0.02 wt-pct Tin Minor 1981
  • Type In-situ
    Estimate year 1985
    Measured 430000mt ore
    Demonstrated 430000mt ore
    Total resources 430000mt ore
    Commodity Subtype Grade units Group Importance Year
    Tungsten Wo3 0.8 wt-pct Tungsten Major 1985
  • Type In-situ
    Estimate year 1990
    Measured 545000mt ore
    Indicated 909000mt ore
    Demonstrated 1454000mt ore
    Total resources 1454000mt ore
    Commodity Subtype Grade units Group Importance Year
    Tungsten Wo3 0.6 wt-pct Tungsten Major 1990

Comments on the reserve resource information

  • RECOVERABLE RESOURCES AT 75% PROBABILITY WERE CALCULATED FROM IN SITU RESERVES USING 90% MINE RECOVERY AND AN AVERAGE OVERALL DILUTION OF 18%.
  • MEASURED + INDICATED + INFERRED PLUS LOW GRADE RESERVES (392,170 MT OF 1.08 W03 AND .03 SN PERCENT ASSAYS) EQUALS TOTAL REPORTED RESERVES OF 741,238 MT OF .71 W03 AND .03 SN PERCENT ASSAYS.
  • ROSKILL INFORMATION SERVICES LTD.: THE ECONOMICS OF TUNGSTEN 1990, SIXTH ED.
  • RESOURCES AS OF 1/83

Workings at the site

  • Type of workings Underground
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ACTUAL
    Mining Method OVERHAND 10-38
    Percent Waste Rock 96.1
    Percent Recovery 90
    Hardness of Rock UNKNOWN
    Rock Characteristics UNKNOWN
    Rock Support Chars. SUPPORTING
    Mine Support Chars. TIMBER
    Number of Adits 6
    1st Condition of Workings OPEN
    Capacity 609
    Capacity Units MT ORE/DAY
    Unit Production Cost 18.14
    Units of Production $/MT ORE
    Operating Days per Year 304
    Operating Shifts per Day 3
    Year of Information 1982

Reference information

Bibliographic references

  • Reserve-Resource

    LAML TOPICAL SUPPLEMENT FOR NOV. 7, 1985. P 3.

  • Reserve-Resource

    ROSKILL INFORMATION SERVICES LTD.; THE ECONOMICS OF TUNGSTEN

  • Reserve-Resource

    6'TH EDITION 1990. P 52.

  • Deposit

    STRUCTURAL GEOLOGY OF THE AREA OF CHOJLLA AND ENRAMADA MINES

  • Deposit

    KRAZ AND BARRIENTOS, JUNE 1979 (SPANISH).

  • Deposit

    PRIMARY TUNGSTEN ASSOCIATION, QUARTERLY BULLETINS 1977-1982.

  • Deposit

    ANON. THE CHOJLLA DEPOSIT, BOLIVIA.

  • Deposit

    COMPENDIUM OF THE ECONOMIC GEOLOGY OF BOLIVIA, 1992; PUB. BY

  • Deposit

    THE MINISTRY OF MINES AND METALLURGY, LA PAZ, BOLIVIA.

General comments

Subject category Comment text
Deposit GRADE IS APPROXIMATE, MINE IS ON 8 PARALLEL VEINS, AN EXTENS PICHU MINE, ABOUT 80 KM E OF LA PAZ, ALL DATA FROM AHLFELD.

Reporter information

Type Date Name Affiliation Comment
Reporter 17-APR-1995 Bleiwas, Donald U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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