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Sigma & Sigma #2

Producer in Quebec, Canada 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 10255083
MAS/MILS ID 1220500041
Record type Site
Current site name Sigma & Sigma #2
Alternate or previous names Sigma Mines Division, Sigma, Sigma 2, Quebec Mining Division

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -77.75575, 48.09939 (WGS84)
Elevation 300
Location accuracy 1000(meters)

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

Geographic areas

Country State
Canada Quebec

Commodities

Commodity Importance
Gold Primary
Silver Secondary

Materials information

Materials Type of material
Chalcopyrite Unknown
Pyrite Unknown
Quartz Unknown
Tourmaline Unknown

Nearby scientific data

Ore Body (1) -77.75575, 48.09939
ListMap

Economic information

Ore body information

  • Strike N45E
    Dip 75S
    Width 5M
    Field Value
    MAS Matrix # 1
    MAS Column # 1
    Type of Orebody #1 SHEAR ZONE
    Shape of Orebody #1 TABULAR
    Shape of Orebody #2 IRREGULAR
    Primary mode of Origin CONT METASOMATIC
    Primary Ore Control CONTACT ZONE
    Secondary Ore Control FAULTING
    Degree of Wallrock Alter. UNKNOWN
    Type of Wallrock Alter. #1 SILICIFICATION
    Strike And Dip N45E:75S
    Minimum Depth to Top 0
    Min. Thick. Unconsol. Mat. 0
    Date of Last Modification 861204
  • Area 594HA
    Field Value
    Total Surface Area (HA) 594
    Date of Last Modification 910418

Comments on the geologic information

  • SHEAR ZONES, RANGING IN THICKNESS FROM A FEW CENTIMETERS TO SEVERAL METERS ARE THE DOMINANT STRUCTURAL FEATURE AT THE MINE.
  • GOLD MINERALIZATION IS MOSTLY CONFINED TO THE QUARTZ- TOURMALINE- PYRITE VEINS THAT OCCUPY FRACTURES AND SHEAR ZONES.

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Producer
Commodity type Metallic
Significant Yes
Discovery year 1924
Mining method Filled Stopes
Year of first production 1937
Milling method Carbon-In-Pulp-Electrowin

Mining district

District name Val D'Or

Mineral rights holdings

Type of mineral rights Located Claim
Type of mineral rights State Lease

Ownership information

  • Type Owner-Operator
    Owner Placer Dome Canada (Placer Dome Inc.)
    Interest 100
    Home office Canada
    Year 1997

Production statistics

  • Year 1966
    Description Gold Ore Mined 407000 Metric Tons Per Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 407000mt
  • Year 1969
    Description Gold Ore Mined 445000 Metric Tons Per Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 445000mt
  • Year 1972
    Description Gold Ore Mined 472000 Metric Tons Per Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 472000mt
  • Year 1975
    Description Gold Ore Mined 451000 Metric Tons Per Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 451000mt
  • Year 1978
    Description Gold Ore Mined 447000 Metric Tons Per Year
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 447000mt
  • Year 1980
    Description 3.94 G Au 439000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 439000mt 4g/mt
  • Year 1981
    Description 4.11 G Au 442000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 442000mt 4g/mt
  • Year 1982
    Description 4.77 G Au 441000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 441000mt 5g/mt
  • Year 1983
    Description 4.70 G Au 436000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 436000mt 5g/mt
  • Year 1984
    Description 4.25 G Au 434000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 434000mt 4g/mt
  • Year 1985
    Description 4.46 G Au 435000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 435000mt 4g/mt
  • Year 1986
    Description 4.90 G Au 447000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 447000mt 5g/mt
  • Year 1987
    Description 4.70 G Au 441000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 441000mt 5g/mt
  • Year 1988
    Description 4.83 G Au 416000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 416000mt 5g/mt
  • Year 1989
    Description 5.00 G Au 451000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 451000mt 5g/mt
  • Year 1990
    Description 4.49 G Au 484000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 484000mt 4g/mt
  • Year 1991
    Description 6.00 G Au 481000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 481000mt 6g/mt
  • Year 1992
    Description 6.10 G Au 445000 Mt Ore
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Ore Gold Gold 445000mt 6g/mt

Comments on the production information

  • DESCRIPTION SHOWS MILL FEED GRADES.

Reserves and resources

  • Type In-situ
    Estimate year 1980
    Indicated 1223000mt ore
    Demonstrated 1223000mt ore
    Total resources 1223000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 6.57 g/mt Gold Major 1980
  • Type In-situ
    Estimate year 1991
    Demonstrated 3990000mt ore
    Total resources 3990000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.8 g/mt Gold Major 1991
  • Type In-situ
    Estimate year 1992
    Demonstrated 3180000mt ore
    Total resources 3180000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.8 g/mt Gold Major 1992
  • Type In-situ
    Estimate year 1993
    Demonstrated 3037000mt ore
    Total resources 3037000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.99 g/mt Gold Major 1993
  • Type In-situ
    Estimate year 1997
    Demonstrated 3578000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 3.9 g/mt Gold Major 1997
  • Type In-situ
    Estimate year 1997
    Demonstrated 1724000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.9 g/mt Gold Major 1997
  • Type In-situ
    Estimate year 1997
    Demonstrated 3225000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.4 g/mt Gold Major 1997
  • Type In-situ
    Estimate year 1997
    Demonstrated 4949000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.574 g/mt Gold Major 1997
  • Type In-situ
    Estimate year 1993
    Demonstrated 3037000mt ore
    Total resources 3037000mt ore
    Commodity Subtype Grade units Group Importance Year
    Gold Au 4.99 g/mt Gold Major 1993

Comments on the reserve resource information

  • RESERVES; TOTAL DEMONSTRATED ORE (PROV+PROB+MEAS+INDI) 12/31/96 PRODUCTION AVG 1995-1996 ORE MILLED:
  • Q-1;C-1, 1982 GOLD STUDY DATA. Q-2;C-3, DEMONSTRATED RESOURCE DATA FOR 1993 CANADIAN GOLD STUDY. SEE RESOURCE DATA SET FOR SOURCE.

Workings at the site

  • Type of workings Underground
    Overall depth 1812M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method OTHER SHRINKAGE METHODS
    Percent Recovery 100
    Hardness of Rock HARDROCK FISSURED WITH MODERATE WATER
    Rock Characteristics UNKNOWN
    Rock Support Chars. SUPPORTING
    Mine Support Chars. STEEL W/LAGGING CONCRETE REINFOR
    Number of Shafts 2
    1st Condition of Workings OPEN
    Capacity 1224
    Capacity Units MT ORE/DAY
    Unit Production Cost 21.75
    Units of Production $/MT ORE
    Operating Days per Year 250
    Operating Shifts per Day 2
    Year of Information 1982

Comments on other economic factors

  • THE DORE BULLION IS TRANSPORTED TO THE ROYAL CANADIAN MINT, VIA BRINKS SECURITY TRUCKS, FOR REFINEMENT.
  • DILUTION OF THE ORE IS 30%. THE MINE IS SERVED BY 2 VERTICAL SHAFTS: NO. 2, 0-960M; NO. 3, 960-1812M. SEVERAL MINING METHODS ARE EMPLOYED AT 516 MA. THESE ARE: SHRINKAGE (32%), ROOM & PILLAR (20%),

Reference information

Bibliographic references

  • Reserve-Resource

    CANADIAN MINES HANDBOOK, 1989-90, P. 370.

  • Reserve-Resource

    CANADIAN MINES HANDBOOK, 1990-91, P. 361.

  • Reserve-Resource

    CANADIAN MINES HANDBOOK, 1991-92, P. 317.

  • Reserve-Resource

    CANADIAN MINES HANDBOOK, 1992-93, PAGE 291.

  • Reserve-Resource

    PLACER DOME INC., PRESS RELEASE, 2/22/93, PAGE 3.

  • Reserve-Resource

    PLACER DOME INC., 1992 ANNUAL REPORT, ATLAS.

  • Reserve-Resource

    CANADIAN MINES HANDBOOK, 1996-97, P343.

  • Reserve-Resource

    PLACER DOME INC. FORM 40-F, 1996, PP. 14, 15.

  • Deposit

    ANNUAL REPORTS, DOME MINES LTD., 1980.

  • Deposit

    ANNUAL REPORTS, SIGMA MINES LTD., 1965-1980.

  • Deposit

    AUDET, A.J. LES MINES SIGMA (QUEBEC) LIMITEE, IN GEOLOGY

  • Deposit

    DIVISION CIM GOLD SYMPOSIUM AND FIELD EXCURSION,1980,PP45-51

  • Deposit

    AUDET, A.J., ROBERT, F., AND BROWN, A.C. STRUCTURAL

  • Deposit

    CONTROL OF GOLD MINERALIZATION AT THE SIGMA MINE, VAL D'OR,

  • Deposit

    QUEBEC. CIM BULLETIN, V. 76, NO. 850, FEB. 1983, PP. 72-80.

  • Deposit

    CANADIAN MINES HANDBOOK. SIGMA MINES LTD. 1981-82,P. 308.

  • Deposit

    CANADIAN MINING JOURNAL. THE APPLICATION OF AEROMAGNETIC

  • Deposit

    GRADIOMETER SURVEY TECHNIQUE TO GOLD EXPLORATION IN THE VAL

  • Deposit

    D'OR MINING CAMP, QUEBEC. SEPT. 1982, PP. 21-39.

  • Deposit

    E & MJ. SIGMA USES EFFICIENT MINING METHODS TO RECOVER

  • Deposit

    LOW-GRADE ORE. DECEMBER 1981, PP. 92-95.

  • Deposit

    MERRILL LYNCH STOCK ANALYSIS REPORT, 1980.

  • Deposit

    NORTHERN MINER. SIGMA PREPARING FOR LONG DRIVE NORTH

  • Deposit

    TOWARD NEW GOLD DISCOVERY. OCT. 18, 1979, P. B9.

  • Deposit

    NORTHERN MINER. SIGMA FINANCING DOME GROUP'S QUEBEC

  • Deposit

    EXPLORATION. MAY 18, 1980, P. B5.

  • Deposit

    CAMADOAM MINES HANDBOOK, 1996-97, PP. 343, 486.

Reporter information

Type Date Name Affiliation Comment
Reporter 28-JUL-97 Buckingham, David A. 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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