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Mina San Gregorio

Past Producer in Rivera, Uruguay with commodity Gold
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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. Ore body information
  11. Economic information about the deposit and operations
  12. Mining district
  13. Ownership information
  14. Reserves and resources
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10061816
MRDS ID TC34781
Record type Site
Current site name Mina San Gregorio
Alternate or previous names Includes Nearby Deposits Explored By Stel, S.A.

Geographic coordinates

Geographic coordinates: -55.51162, -31.53821 (WGS84)
Location accuracy 10000(meters)
Relative position ABOUT 3 1/2 KM WSW OF MINAS DE CORRALES.

Site location context

Political divisions (FIPS codes)

Rivera(province)

Uruguay(country)

South America(continent)

Land(continent)

Geographic areas

Country State
Uruguay Rivera

Commodities

Commodity Importance
Gold Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Gold Ore
Pyrite Ore
Quartz Gangue

Mineral occurrence model information

Model code 273
USGS model code 36a
Deposit model name Low-sulfide Au-quartz vein
Mark3 model number 27

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Stratigraphic age (youngest) Neoproterozoic

Nearby scientific data

(1) -55.51162, -31.53821
ListMap

Economic information

Ore body information

  • Strike EW
    Dip 55-75N
    Thickness 10M

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1889
Year of last production 1936
Production years 1889-1936

Mining district

District name La Faja De Oro De Rivera

Ownership information

  • Type Operator
    Owner Arc Joint Ventured (50 Percent) With Stel S. A. Is To Operate
    First year 1992
  • Type Owner
    Owner Uruguay Consolidated Gold Mines Ltd ; Stel S. A. (Cia. De Mineracao Do Amapa) 1990'S
    First year 1980
    Last year 1936

Comments on the production information

  • ARC PLANNING A 90,000 TON PER YEAR OPEN PIT.

Reserves and resources

  • Type In-situ
    Estimate year 1992
    Total resources 4800000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 3 g/mt Gold Major 1992

Comments on the reserve resource information

  • ORE (1) GEOLOGIC RESOURCES; ORE (2) RECOVERABLE MINING RESERVE AT A DILUTED GRADE; ORE (3) PROVEN RESERVES WITH 10 MILLION TONS INDICATED BY DRILLING AT SIMILAR GRADE. AU PROVEN AND PROBABLE OUNCES "VERIFIED BY INDEPENDENT AUDIT." 1994 RESERVES ARE MINEABLE RESERVES.

Comments on the workings information

  • UP TO 1909 ALL WORK WAS DONE ON THE SURFACE ALONG LENGTH OF 1300 M. AFTER WERE THREE STOPES, THE LARGEST 80 M LONG TO DEPTHS OF 80 M; NEW (1992) WORKINGS TO BE 1500 T/D OPEN PIT.

Comments on development

  • ARC PROCEEDING WITH ENGINEERING PROJECT FOR OPEN-PIT (1994). RESERVES BASED ON MORE THAN 39000 FT OF RC AND DIAMOND DRILLING.

Reference information

Bibliographic references

  • Deposit

    BOSSI, JORGE, 1978, RECURSOS MINERALES DEL URUGUAY: ED. DANIEL ALJANATI, IMPRESORA REX S.A., MONTEVIDEO, URUGUAY, 348 P.

  • Deposit

    ANON, 1992, URUGUAY: ADVERTISEMENT SUPPLEMENT TO MINING JOURNAL, LONDON: MINING JOURNAL LONDON, V. 319, NO. 8186, 8 P.

  • Deposit

    ANON, 1992, AMERICAN RESOURCES IN SOUTH AMERICA, MINING JOURNAL, LONDON, V. 319, NO. 8195, P. 267.

  • Deposit

    ANON., 1993, GOLD PRODUCTION COMMENCES AT MAHOMA MINE IN URUGUAY: THE MINING RECORD, FEBRUARY 10, 1993, P. 43.

  • Deposit

    ANON., 1994, AMERICAN ACTIVE AT SAN GREGORIO: THE NORTHERN MINER, SEPTEMBER 26, 1994, V. 80, NO. 30, P. 13.

  • Other Database

    CIMRI

  • Production

    BOSSI (1978). ANON (1994).

  • Reserve-Resource

    MINING JOURNAL (1992); ANON. (1993); ANON. (1994).

General comments

Subject category Comment text
Deposit TWO QUARTZ VEINS WITH 6-30 M SEPARATION, EASTERN END 10 M OF MINERALIZATION WITH EXTREMELY RICH 200 M QUARTZ VEIN; MINERALIZED SHEAR ZONES 400 M LONG, 2-30 M WIDE WITH MINERALIZATION DOWN TO 150 M WHICH REMAINS OPEN.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1992 Page, Norman J. U.S. Geological Survey
Updater 01-NOV-1994 Page, Norman J. U.S. Geological Survey

Beyond USGS

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

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