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Toldos Mine

Producer in Potosi, Bolivia with commodities Silver, Lead, Zinc, Arsenic, Antimony, Copper
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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. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  17. Ownership information
  18. Reserves and resources
  19. Workings at the site
  20. Links to other databases
  21. Bibliographic references
  22. General comments
  23. Reporter information

Geologic information

Identification information

Deposit ID 10080448
MRDS ID W031641
Record type Site
Current site name Toldos Mine

Geographic coordinates

Geographic coordinates: -67.20225, -21.10979 (WGS84)
Elevation 4100
Relative position 2 KM S OF SAN CRISTOBAL

Site location context

Political divisions (FIPS codes)

Potosi(province)

Bolivia(country)

South America(continent)

Land(continent)

Federal lands

Federal(land status)

Geographic areas

Country State
Bolivia Potosi

Comments on the location information

  • PRESENT OPEN PIT AT HEAD OF QUEBRADA ABOVE MAIN TOLDOS UNDERGROUND WORKINGS. PIT EXTENDS TO SE EDGE OF UNDERGROUND INCA MINE WORKINGS.

Commodities

Commodity Importance
Silver Primary
Lead Primary
Zinc Critical Tertiary
Arsenic Critical Tertiary
Antimony Critical Tertiary
Copper Tertiary

Materials information

Materials Type of material
Galena Ore
Polybasite Ore
Pyrargyrite Ore
Silver Ore
Sphalerite Ore
Stromeyerite Ore
Tetrahedrite Ore
Barite Gangue
Calcite Gangue
Hematite Gangue
Magnetite Gangue
Pyrite Gangue
Quartz Gangue
Siderite Gangue
Chalcopyrite Unknown

Alteration

  • (Local) Rhyodacite Porphyry Is Sericitized

Analytical data

Result RUN OF MINE ORE IN MAY 1990 ASSAYED 100 G/T AG, 50 PPM CU, 3000 PPM PB, 150 PPM SB, 1000 PPM ZN, <2 PPB AU, <10 PPM SN, <200 PPM AG, <10 PPM BI

Mineral occurrence model information

Model code 77
USGS model code 20b
Deposit model name Sn-polymetallic vein

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyodacite
    Stratigraphic age (youngest) Miocene
    Stratigraphic age (youngest) Miocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyodacite

Nearby scientific data

(1) -67.20225, -21.10979
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Sedimentary Rocks Folded Into Anticline, Trending N 10 W

Ore body information

  • General form IRREGULAR BRANCHING TABULAR VEINS
    Strike N 35 TO 40 E
    Dip 55NW TO VERTICAL
    Length 400M
    Width 350M
    Depth to top 0M
    Depth to bottom 100M

Controls for ore emplacement

  • N 30 To 40e Trending Fault Set

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Discoverer Spanish Colonists
Year of first production 1870

Mining district

District name San Cristobal

Land status

Ownership category Federal

Ownership information

  • Type Operator
    Owner Empresa Minera Yaua Mallcu
  • Type Owner
    Owner Corporacion Minera Del Sur (Comsur)

Reserves and resources

  • Type In-situ
    Estimate year 1990
    Total resources 3000000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Silver Ag 150 g/mt Silver Major 1990

Comments on the reserve resource information

  • OPEN PIT RESERVES; ITEM 2 IS INDICATED ORE

Workings at the site

  • Type of workings Surface/Underground
    Overall depth 70M
    Overall length 228.6M
    Overall width 150M

Comments on the workings information

  • ORIGINAL UNDERGROUND WORKINGS CONSISTS OF ONE ADIT WITH MANY CROSS-CUTS, DRIFTS, A MAIN LEVEL AND LESSER LOWER LEVELS. CURRENT OPERATION IS BY OPEN PIT.

Comments on development

  • WAS OWNED BY EMUSA IN 1975. MINE OPERATED FROM 1870 TO 1921 BY CIA MINERA DE SAN CRISTOBAL. EXPLORED BY LIPEZ MINING CO. 1966. ; MILL.CAP: 375 ; ECON.YEAR: 1990 ; ECON.COM: ORE CRUSHED TO -1", CONVEYOR TO ORE PILE, TRUCKED TO LEACH FACILITY, CYANIDE HEAP LEACH WITH 60 TO 70% AU RECOVERY

Reference information

Bibliographic references

  • Deposit

    AHLFELD, F. AND SCHNEIDER-SCHERBINA, A., 1964, LOS YACIMIENTOS MINERALES Y DE HIDROCARBUROS DE BOLIVIA: DEPARTAMENTO NACIONAL DE BOLIVIA, NO. 5.

  • Deposit

    GAMARRA IBARGUEN, REYNALDO, 1967, ESTUDIO GEOLOGICO REGIONAL Y ESPECIALIZADO DE LA REGION DE SAN CRISTOBAL, MINAS TOLDOS Y SANTA BARBARA DE JAYULA: UNPUBLISHEDTESIS DE GRADO, UNIVERSIDAD MAYOR DE SAN ANDRES

  • Deposit

    TORRICO, H., 1966, ESTUDIO GEOLOGICO DE LA REGION DE SAN CRISTOBAL: UNPUBLISHED TESIS DE GRADO, UNIVERSIDAD MAYOR DE SAN ANDRES, FACULTAD DE CIENCIAS GEOLOGICAS

  • Deposit

    DELGADILLO, E., 1967, INFORME SOBRE PROSPECCION GEOFISICA MINA DE PLOMO Y P[LATA TOLDOS: SERVICIO GEOLOGICO DE BOLIVIA INFORME GB-M-541, 8P., MAPS 1:2,000; 1:1,000; 1:500.

  • Deposit

    JACOBSON, H.S., AND MURILLO, C., 1969, GEOLOGY AND MINERAL DEPOSITS OF THE SAN CRISTOBAL DISTRICT, VILLA MARTIN PROVINCE, POTOSI, BOLIVIA: U.S. GEOLOGICAL SURVEY BULLETIN 1273, 22P., MAPS.

  • Deposit

    AHLFELD, F., 1944, LA GEOLOGIA DEL MINERAL DE SAN CRISTOBAL DE LIPEZ (BOLIVIA): MINERIA BOLIVIANA, V. 1, N. 8, P. 9-15.

  • Deposit

    AVILA-SALINAS, W., PLOSKONKA, E., AND ARDUZ T., M., 1975, ESTUDIO PETROGRAFICO DE LA MINA TOLDOS, DEPARTAMENTO DE POTOSI: SERVICIO GEOLOGICO DE BOLIVIA, INFORME, 27P.

  • Deposit

    GEOLOGICAL, GEOCHEMICAL AND GEOPHYSICAL INVESTIGATIONS BY JACOBSON ET AL (1969)

  • Deposit

    GEOPHYSICAL INVESTIGATIONS BY GEOBOL (DELGADILLO, 1967)

  • Deposit

    VISITED BY USGS/GEOBOL PERSONNEL MAY 1990

  • Deposit

    THESIS BY TORRICO (1966)

  • Production

    STATE DEPARTMENT MINERALS REPORT BOLIVIA 1988, P. 42

  • Reserve-Resource

    CORNELIO BARRIOS H., MINE GEOLOGIST, PERS. COMM.

General comments

Subject category Comment text
Deposit MAJOR VEINS ARE THE BONANZA AND CUARESMA; BARBA VEIN IS INTERMEDIATE IN SIZE. DEPOSIT CONSISTS OF 0.5 TO 1.0 M VEINS WHICH WERE EXPLOITED IN COLONIAL TIMES AND 1 TO 30 CM VEINLETS WHICH MAKE UP THE CURRENTLY EXPLOITED ORE.
Deposit GEOPHYSICAL SURVEY: GROUND MAGNETICS, 276,000 CU M AREA, 13 LINES SEPARATED BY 50 M, 20 M POINT SPACING ALONG LINES. ; INFO.SRC : 1 PUB LIT; 2 UNPUB REPT; 3 FIELD OBSERV; 5 PERS COMM

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-1978 Urquidi-Barrau, Fernando Department of State
Updater 01-DEC-1990 Long, Keith R. And Ludington, S. And Richter, D. U.S. Geological Survey

Beyond USGS

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

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