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Sao Bento

Plant in Minas Gerais, Brazil with commodities Gold, Silver
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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. Ownership information
  13. Production statistics
  14. Reserves and resources
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. Reporter information

Geologic information

Identification information

Deposit ID 10255216
MAS/MILS ID 3510230140
Record type Site
Current site name Sao Bento

Geographic coordinates

Point of reference Town
Geographic coordinates: -43.33224, -19.94749 (WGS84)
Elevation 750
Location accuracy 10000(meters)

Site location context

Political divisions (FIPS codes)

Minas Gerais(province)

Brazil(country)

South America(continent)

Land(continent)

Geographic areas

Country State
Brazil Minas Gerais

Comments on the location information

  • LAT/LONG FOR THE TOWN OF SANTA BARBARA, MINAS GERIS BRAZIL 10 KM FROM THE MINE.

Commodities

Commodity Importance
Gold Primary
Silver Primary

Materials information

Materials Type of material
Gold Unknown

Nearby scientific data

Town (1) -43.33224, -19.94749
ListMap

Economic information

Ore body information

  • Thickness 35M
    Length 250M
    Area 800HA
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 SHEAR ZONE
    Primary mode of Origin UNKNOWN
    Primary Ore Control FAULTING
    Secondary Ore Control FRACTURING
    Total Surface Area (HA) 800
    Date of Last Modification 940308

Comments on the geologic information

  • ALL FORMATIONS STRIKE 35-40 DEGREES EAST AND DIP 55-60 DEGREES SOUTHEAST.

Economic information about the deposit and operations

Operation type Underground
Development status Plant
Commodity type Metallic
Significant Yes
Discovery year 1860
Mining method Combined Methods - Shrinkage W/Cut and Fill
Year of first production 1896
Plant type Beneficiation (Mill)
Plant subcategory Hydromet
Milling method Flotation

Mining district

District name Iron Quadrangle

Mineral rights holdings

Type of mineral rights Patented

Ownership information

  • Type Operator
    Owner Sao Bento Gold Estates
    Home office United Kingdom
    Year 1990
    First year 1896
    Last year 1906
  • Type Owner
    Owner John Taylor And Sons
    Interest 100
    Home office United Kingdom
    Year 1990
    First year 1896
    Last year 1905
  • Type Operator
    Owner South American Gold Areas
    Year 1990
    First year 1923
    Last year 1923
  • Type Operator
    Owner South American Gold Areas
    Year 1989
    First year 1944
    Last year 1944
  • Type Operator
    Owner Unamgen
    Home office Brazil
    Year 1990
    First year 1979
    Last year 1984
  • Type Operator
    Owner Sao Bento Mineracao
    Interest 100
    Home office Brazil
    Year 1989
    First year 1984
  • Type Owner
    Owner Amira
    Interest 51
    Home office Brazil
    Year 1989
    First year 1984
  • Type Owner
    Owner General Mining Corp. Ltd.
    Interest 49
    Home office South Africa
    Year 1989
    First year 1984

Production statistics

  • Year 1895
    Description 1860-1896 Ore Produced 20000 Mt Ore
  • Year 1906
    Description 1896-1905 Gold Produced 211000 Oz Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 6562834.49g
  • Year 1906
    Description 1896-1906 Ore Produced 410000 Mt Ore
  • Year 1923
    Description Ore Treated 6000 Mt Ore
  • Year 1985
    Description Ore Hoisted From Underground 6277 Tons Ore
  • Year 1986
    Description Ore Hoisted 61582 Tons Ore
  • Year 1987
    Description Initial Production 20000 Mt Ore Milled Per Month
  • Year 1987
    Description Recovered Gold 1458105 Grams Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 1458105g
  • Year 1987
    Description Ore Hoisted 207383 Tons Ore
  • Year 1988
    Description Recovered Gold 1930392 G Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 1930392g
  • Year 1988
    Description Ore Hoisted 261893 Tons Ore
  • Year 1989
    Description Recovered Gold 2074620 G Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 2074620g
  • Year 1989
    Description Ore Hoisted 276717 Tons Ore
  • Year 1990
    Description Recovered Gold 2003115 G Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 2003115g
  • Year 1990
    Description Ore Hoisted 266250 Tons Ore
  • Year 1991
    Description Recovered Gold 2349111 G Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 2349111g
  • Year 1991
    Description Ore Hoisted 335336 Tons Ore
  • Year 1992
    Description Recovered Gold Thru June 1320664 G Gold
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 1320664g
  • Year 1992
    Description Ore Hoisted Thru June 181613 Tons Ore
  • Year 1993
    Description Proposed Production 320 Kg Gold Per Month
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 3840000g
  • Year 1993
    Description Proposed Production 40000 Mt Ore Milled Per Month
  • Year 1993
    Accuracy Estimate
    Description Annual Gold Production (Estimated) 100000 Ounces Of Gold Per Year.
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Gold Gold 3110348.1g
  • Year 1994
    Description Proposed Production 70000 Mt Ore Per Month

Reserves and resources

  • Type In-situ
    Estimate year 1990
    Inferred 5936000mt ore
    Total resources 5936000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 9.61 g/mt Gold Major 1990
  • Type In-situ
    Estimate year 1990
    Measured 405000mt ore
    Demonstrated 405000mt ore
    Total resources 405000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 9.15 g/mt Gold Major 1990
  • Type In-situ
    Estimate year 1990
    Inferred 3102000mt ore
    Total resources 3102000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 9.62 g/mt Gold Major 1990

Comments on the reserve resource information

  • QM-C1: RECOVERABLE ORE RESOURCES USED IN THE 1993 GOLD STUDY.
  • 1989 PRODUCTION OF 69,000 OZ AU. EXPANDING TO 128,000 OZ BY 1993. MILLING RATE OF 25,000 MTPM OR 300,000 MTPY. FINAL CAP COST OF $85 MILLION. GEOGRAPHIC COORDINATES FOR TOWN OF SANTA BARBARA. MEASURED RESERVES OF 405,000 MT AT 9.15 G/MT AU. IDENTIFIED RESERVES OF 5,936,000 MT AT 9.61 G/MT AU. MINE STARTED UP IN 1985, WITH FIRST GOLD POUR IN DEC. 1986. CURRENT (1991) CAPACITY 29000 MPTM TO PRODUCE 2,916 KG AU PER YEAR. VERTICAL SHAFT WILL BE OPERATING FULLY FOR REEF AND WASTE BY DECEMBER 1993. TONNAGE WILL INCREASE TO 38,000 MTPM IN APRIL 1993 WITH COMMISSIONING OF THE SECOND BIOX REACTOR IN FEBRUARY 1993. PRODUCTION OF AU EXPECTED TO INCREASE TO 320 KG/MONTH BY END OF 1993. EXPANSION OF VERTICAL SHAFT CAPACITY WITH PURCHASE OF SECOND HOIST IS PLANNED FOR 1994. FINAL OUTPUT CAPACITY WILL BE 70,000 MTPM ORE. APRIL 94 ADIT CORRECTION BASED ON 1993 GOLD STUDY ETD.

Workings at the site

  • Type of workings Underground
    Overall depth 960M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ACTUAL
    Mining Method SHRINKAGE W/CUT AND FILL
    Number of Shafts 1
    Number of Inclines 3
    Number of Adits 1
    1st Condition of Workings OPEN
    Capacity 2794.5
    Capacity Units MT ORE/DAY
    Unit Production Cost 27
    Units of Production $/MT ORE
    Operating Days per Year 365
    Operating Shifts per Day 4
    Year of Information 1991

Comments on other economic factors

  • CAPACITY AND UNIT COST PRODUCTION ARE FOR 1991.

Reference information

Bibliographic references

  • Production

    ENGINEERING MINING JOURNAL, P. 18-WW (FEB. 1993).

  • Deposit

    E&MJ, JUNE 1990, PP.30-34.

  • Deposit

    *SKILLINGS MINING REVIEW, NOV. 25. 1989, PP.4-6.

  • Deposit

    *MINING JOURNAL, LONDON, OCT. 6, 1989, P. 279; JAN. 1, 1993,

  • Deposit

    P. 9; JAN. 5, 1990.

  • Deposit

    *SUPPLEMENT TO MINING JOURNAL, FEB. 23, 1990, P.

  • Deposit

    *MINING JOURNAL, AUG. 24, 1984, P. 129.

  • Deposit

    *MINING MAGAZINE, OCT. 1984, P. 293; MAR. 1990, P. 170;

  • Deposit

    FEB. 1993, P. 91.

  • Deposit

    *DEPT. OF STATE, UNCLASSIFIED, DEC. 1992.

  • Deposit

    *PERTH GOLD 88, START UP OF THE SHERRITT PRESSURE OXIDATION

  • Deposit

    PROCESS AT SAO BENTO, CARVALHO, HAINES, DA SILVA, DOYLE,

  • Deposit

    PP. 152-156.

  • Deposit

    *FAX FROM SAO BENTO MINERACAO S/A, SEPT. 15, 1992, 7 PAGES.

  • Deposit

    *SAO BENTO MINERACAO S/A BOOKLET, 20 MAY, 1988, REVISED

  • Deposit

    04/10/90.

  • Reserve-Resource

    E&MJ, JUNE 1990, SAO BENTO PLANS BIOX, PAGES 30-34.

Reporter information

Type Date Name Affiliation Comment
Reporter 28-JUL-1994 Peterson, Gary R. 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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