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Monserrat Mine

Past Producer in Oruro, Bolivia with commodities Tin, Arsenic, Antimony, Zinc, Silver, Lead
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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. Ownership information
  16. Production statistics
  17. Reserves and resources
  18. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10006344
MRDS ID BL20344
Record type Site
Current site name Monserrat Mine
Alternate or previous names Ichicollo, Ichikollo

Geographic coordinates

Geographic coordinates: -66.86197, -18.41431 (WGS84)
Elevation 4100
Relative position 11.5 KM S65E OF POOPO

Site location context

Political divisions (FIPS codes)

Oruro(province)

Bolivia(country)

South America(continent)

Land(continent)

Geographic areas

Country State
Bolivia Oruro
Bolivia Oruro

Comments on the location information

  • LOCATED ON THE WEST FLAMK OF SERRANIA DE ANTEQUERA. IN 1924, HOLDING OF CIA. MINERA MONSERRAT WERE 512 HA IN 7 CONCESSIONS (ANITA, 16 HA; MONSERRAT, 200 HA; SAN JOSE, 30 HA; SAN CARLOS, 200 HA; GUADALUPE, 26 HA; LA MASCOTA, 24 HA; LA PROTECTORA, 16 HA). AN ADDITIONAL CONCESSION, CALLED "KINGS", OF 500 HA, WAS APPLIED FOR IN THE SAME YEAR.

Commodities

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

Materials information

Materials Type of material
Cassiterite Ore
Galena Ore
Sphalerite Ore
Stannite Ore
Wurtzite Ore
Alunite Gangue
Dolomite Gangue
Marcasite Gangue
Pyrite Gangue
Pyrrhotite Gangue
Quartz Gangue
Tourmaline Gangue
Vivianite Gangue

Alteration

  • (Local) Weak Silicification Of Wallrock. Fragments Of Shale Within The Vein Are Silicified And Sericitized. Veins Oxidized To A Depth Of 20-30 M. Zone Of Secondary Enrichment Underlies Oxidized Zone.

Analytical data

Result AVERAGE GRADE OF ORE IS 4% SN, 15% ZN, 2% PB, AND 500 G/MT AG.

Mineral occurrence model information

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

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Shale
    Stratigraphic age (youngest) Late Silurian
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Sandstone

Nearby scientific data

(1) -66.86197, -18.41431
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Economic information

Geologic structures

Type of structure Regional
Structure description Nw-Trending Folds

Ore body information

  • Strike N 22-59 E; N12W
    Dip 60-86 SE/NW; 74NE
  • Strike N 22-59 E; N12W
    Dip 60-86 SE/NW; 74NE

Controls for ore emplacement

  • Normal Fault; Fracture System N20e 70-80se Up To 2.5 M Wide.

Comments on the geologic information

  • NO IGNEOUS ROCKS OUTCROP AT MONSERRAT. THE NEAREST IGNEOUS ROCKS ARE DACITE INTRUSIVES AT AVICAYA, 10 KM TO THE SOUTH. HOST ROCKS STRIKE N32-45W DIP 50-62 SW AND N20E 42 NW.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant No
Discoverer Spanish Colonists
Year of first production 1926
Year of last production 1948

Ownership information

  • Type Operator
    Owner Compania Minera Monserrat
    First year 1924
    Last year 1948
  • Type Owner
    Owner Compania Minera Monserrat ; Corporacion Minera De Bolivia
    First year 1924
    Last year 1948

Production statistics

  • Year 1940
    Accuracy Estimate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Tin Tin 3wt-pct

Comments on the production information

  • (1) PRODUCTION BY CIA. MINERA MONSERRAT.

Reserves and resources

  • Type In-situ
    Estimate year 1940
    Total resources 3000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Tin Sn 4 wt-pct Tin Major 1940
  • Type In-situ
    Estimate year 1924
    Total resources 26000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Tin Sn 6 wt-pct Tin Major 1924
    Silver Ag 28.1 g/mt Silver Trace 1924
  • Type In-situ
    Estimate year 1924
    Total resources 52000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Tin Sn 7.4 wt-pct Tin Major 1924
    Silver Ag 20.5 g/mt Silver Trace 1924
  • Type In-situ
    Estimate year 1924
    Total resources 306000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Tin Sn 5.9 wt-pct Tin Major 1924
    Silver Ag 27.7 g/mt Silver Trace 1924
  • Type In-situ
    Estimate year 1924
    Total resources 185000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Tin Sn 6.1 wt-pct Tin Major 1924
    Zinc Zn 24.4 wt-pct Zinc Trace 1924
    Silver Ag 26.4 g/mt Silver Trace 1924

Comments on the reserve resource information

  • (2) POSITIVE; (3) PROBABLE; (4) AWAITING DEVELOPMENT; (5) POSSIBLE; ITEMS 2-5 CONTAIN SIGNIFICANT AMOUNTS OF OXIDIZED ORE WITH LESS THAN 2% ZN, ENRICHED SULFIDE ORES CONTAIN 20-27% ZN.

Workings at the site

  • Type of workings Underground
    Overall depth 265M

Comments on the workings information

  • MAIN HAULAGE TUNNEL (SAN CARLOS ADIT ON 3RD LEVEL) IS 1700 M LONG, MOSTLY ALONG THE VEIN. DEEPEST LEVEL IS 7TH LEVEL, 130 M BELOW SAN CARLOS ADIT LEVEL AND 265 M BELOW OUTCROP OF THE VEIN. THERE ARE MANY OLD INCLINE SHAFTS AND ADITS, AND SEVERAL MODERN SHAFTS AND OTHER WORKINGS.

Comments on development

  • ECON.COM: MONSERRAT MINING CO. BUILT AND OPERATED A 100 MT/DAY GRAVITY MILL WHICH RECOVERED TIN-BEARING MINERALS ONLY. MILL WAS LOCATED 12 KM S75W OF MINE AT CALLIPAMPA WHICH IS 7.7 KM S6W OF POOPO. SEE MRDS RECORD #BL20342 FOR DESCRIPTION OF CALLIPAMPA MILL TAILINGS.

Reference information

Bibliographic references

  • Deposit

    LEIDING, B., 1962, INFORMACION GENERAL SOBRE EL MINERAL ICHOCOLLO (POOPO) EN BOLIVIA.

  • Deposit

    GUSTAVSON ASSOC., 1992, COMPENDIUM OF THE ECONOMIC GEOLOGY OF BOLIVIA

  • Deposit

    AHLFELD, F., AND SCHNEIDER-SCHERBINA, A., 1964, LOS YACIMIENTOS MINERALES Y DE HIDROCARBUROS DE BOLIVIA: DEPARTAMENTO NACIONAL DE GEOLOGIA BOLETIN 5, P. 160-161

  • Deposit

    GIBSON, R., AND TURNEAURE, F.S., 1950, TIN DEPOSIT OF THE MONSERRAT MINE, BOLIVIA: TRANSACTIONS AIME, V. 187, P. 1071-1078.

  • Deposit

    DIAZ O., E., 1924, INFORME SOBRE LAS MINAS DE ICHICOLLO, DEPARTAMENTO DE ORURO, BOLIVIA: SANTIAGO, COMPANIA MINERA MONSERRAT, 52 P.

  • Other Database

    CIMRI

  • Production

    AHLFELD AND SCHNEIDER-SCHERBINA (1964)

General comments

Subject category Comment text
Deposit MAIN VEIN (VETA A) IS A LOCALLY BRANCHING VEIN, STRIKE N40E, DIP 80 SE, 0.15 TO 0.60 M WIDE WITHIN A 16400 M LONG NORMAL FAULT WITH SHOOTS OF SN-BEARING TEALLITE AND OTHER SHOOTS OF CASSITERITE IN BANDED, DRUSY VEINS. STRIKE OF FAULT VEIN CHANGES GRADUALLY FROM N22E ON THE SOUTH TO N50E TO THE NORTH. PARAGENESIS IS: (1) EARLY QUARTZ-PYRITE-SPHALERITE; (2) DRUSY QUARTZ WITH MINOR TOURMALINE, PYRITE AND MARCASITE AFTER PYRRHOTITE, TEALLITE, ARSENOPYRITE, STANNITE, SPHALERITE, WURTZITE, GALENA, AND CASSITERITE; (3) LATE COLLOIDAL OPEN-SPACE FILLINGS OF FRANCKEITE, PYRITE, MARCASITE, DOLOMITE, ALUNITE, AND VIVIANITE. TEALLITE IS LARGELY REPLACED BY GALENA-CASSITERITE-PYRITE. IN PLACES, FINELY DISSEMINATED SULFIDES EXTEND A FEW CEM INTO THE WALLROCK OF THE VEIN. OTHER VEINS ARE: VETA B, N32E 80SE, 300 M LONG; VETA C, N59E 75SE, 560 M LONG; VETA D, 330 M SPLAY OF VETA A; VETA E, N19E 80NW, 350 M LONG; VETA F, N12W 74NE, 280 M LONG; AND VETA H, N39E 80NW, 500 M LONG. AT LEAST 12 OTHER VEINS
Deposit OUTCROP.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1993 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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