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  3. Mineral Resource Data System (MRDS)

Chojlla

Plant 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 10207117
MAS/MILS ID 3350200058
Record type Site
Current site name Chojlla
Alternate or previous names Carmen

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -67.7662, -16.3977 (WGS84)
Elevation 1900
Location accuracy 5000(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 Primary
Tungsten Critical Primary

Materials information

Materials Type of material
Arsenopyrite Unknown
Cassiterite Unknown
Chalcopyrite Unknown
Galena Unknown
Pyrite Unknown
Pyrrhotite Unknown
Quartz Unknown
Sphalerite Unknown
Wolframite Unknown

Nearby scientific data

Ore Body (1) -67.7662, -16.3977
ListMap

Economic information

Ore body information

  • Strike N20W
    Dip 40E
    Thickness 1M
    Length 1400M
    Width 150M
    Area 3200HA
    Depth to top 0M
    Field Value
    Type of Orebody #1 FISSURE VEIN
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 REPLACEMENT
    Shape of Orebody #2 LENTICULAR
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control FAULTING
    Secondary Ore Control BEDDING
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 PYRITIZATION
    Type of Wallrock Alter. #2 SILICIFICATION
    Strike And Dip N20W:40E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 3200
    Date of Last Modification 780213

Economic information about the deposit and operations

Operation type Underground
Development status Plant
Commodity type Metallic
Significant Yes
Mining method Open Stope - Overhand
Plant type Beneficiation (Mill)
Plant subcategory Gravity
Milling method Gravity

Mining district

District name Yanacachi Mining District

Mineral rights holdings

Type of mineral rights State Lease
Type of mineral rights Minerals Only

Land status

Ownership category State

Ownership information

  • Type Owner-Operator
    Owner International Mining Co. (Imco)
    Interest 100
    Home office Bolivia
    Year 1982

Production statistics

  • Year 1973
    Period 1971-1973
    Description Mt Ore/Yr 1971 Thru 1973 271000 Mt Ore
  • Year 1974
    Description Mt Ore/Yr 267000 Mt Ore
  • Year 1975
    Description Mt Ore/Yr 314000 Mt Ore
  • Year 1976
    Description Mt Ore/Yr 308000 Mt Ore
  • Year 1977
    Description Mt Ore/Yr 310000 Mt Ore
  • Year 1978
    Description Mt Ore/Yr 312000 Mt Ore
  • Year 1979
    Description Mt Ore/Yr 259000 Mt Ore
  • Year 1980
    Description Mt Ore/Yr 257000 Mt Ore
  • Year 1984
    Period 1981-1984
    Description Mt Ore/Yr 1981 Thru 1984 280000 Mt Ore
  • Year 1985
    Description Mt Ore/Yr 142000 Mt Ore
  • Year 1986
    Description Mt Ore/Yr 131000 Mt Ore
  • Year 1987
    Description Mt Ore/Yr 130000 Mt Ore
  • Year 1988
    Description Mt Ore/Yr 134000 Mt Ore

Reserves and resources

  • Type In-situ
    Estimate year 1990
    Measured 400000mt ore
    Indicated 400000mt ore
    Demonstrated 800000mt ore
    Total resources 800000mt ore
    Commodity Subtype Grade units Group Importance Year
    Tungsten Wo3 0.4 wt-pct Tungsten Major 1990
  • Type In-situ
    Estimate year 1992
    Demonstrated 514388mt ore
    Inferred 238614mt ore
    Total resources 753002mt ore
    Commodity Subtype Grade units Group Importance Year
    Tungsten Wo3 1.43 wt-pct Tungsten Major 1992

Comments on the reserve resource information

  • LIKE MOST OF THE BOLIVIAN TIN PRODUCERS, HIGH PRODUCTION COSTS AND LOW TIN VALUES CAUSE MOST OF THESE MINES TO LOSE MONEY. THE BOLIVIAN GOV. MAINTAINS PRODUCTION IN THESE MINES BECAUSE THEY ARE A MAJOR SOURCE OF CURRENCY (SOMETHING NECESSARY IN AN ECONOMY THAT DEVALUES THEIR CURRENCY DAILY).
  • R2 REPRESENTS COMBINED SN-W GRADE

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 23.6
    Hardness of Rock HARDROCK FISSURED WITH MODERATE WATER
    Rock Support Chars. SUPPORTING MAY BACK SLAB
    Mine Support Chars. OTHER
    Capacity 921
    Capacity Units MT ORE/DAY
    Unit Production Cost 20.45
    Units of Production $/MT ORE
    Operating Days per Year 304
    Operating Shifts per Day 3
    Year of Information 1981
  • Type of workings Underground
    Field Value
    MAS Development Schedule # 2
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Capacity 427
    Capacity Units MT ORE/DAY
    Unit Production Cost 14.08
    Units of Production $/MT ORE
    Operating Days per Year 304
    Operating Shifts per Day 3
    Year of Information 1989

Reference information

Bibliographic references

  • Reserve-Resource

    ROSKILL INFORMATION SERVICES LTD.; THE ECONOMICS OF TUNGSTEN

  • Reserve-Resource

    6'TH EDITION 1990. P 48.

  • Deposit

    AHLFELD, F., 1954, LOS YACIMIENTOS MINERALES DE BOLIVIA: BAN

  • Deposit

    MINERO DE BOLIVIA, LA PAZ, PG. 111-112, PRINTED IN BILBAO, S

  • Deposit

    IMPRENTA INDUSTRIAL S. A., IN SPANISH.

  • Deposit

    PEREIRA BASCOPE, G., 1968, INVESTIGACIONES PRELIM. SOBRE TEC

  • Deposit

    Y METALOGEN. EN LAS CORD. REAL Y QUIMSA CRUZ: SER. GEOL. DE

  • Deposit

    BOL. 9, LA PAZ, 99 PGS.

  • Deposit

    CLARK, A., FARRAR, E, 1973, THE BOL. TIN PROVINCE: NOTES ON

  • Deposit

    AVAILABLE GEOCHRONOLOGICAL DATA: ECON. GEOL., V. 68, P. 102-

  • Deposit

    ENGINEERING AND MINING JR., 1975, INTERN. DIRECTORY OF MININ

  • Deposit

    MCGRAW HILL, N. Y., P. 214.

  • Deposit

    ANON., THE CHOJLLA DEPOSIT, BOLIVIA.

  • Deposit

    KRAZ & BARRIENTOS - STRUCTURAL GEOLOGY OF THE CHOJLLA AND

  • Deposit

    ENRAMADA MINES, JUNE 1979 REPORT (IN SPANISH).

General comments

Subject category Comment text
Deposit WOLFRAMITE TO CASSITERITE RATIO IS 3 TO 2, APLITE DIKE IS CU VEINS.

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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