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Granduc

Past Producer in British Columbia, Canada with commodities Copper, 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. Reserves and resources
  14. Workings at the site
  15. Links to other databases
  16. Bibliographic references
  17. Reporter information

Geologic information

Identification information

Deposit ID 10255601
MAS/MILS ID 1220100015
Record type Site
Current site name Granduc

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -130.35177, 56.21647 (WGS84)
Elevation 750
Location accuracy 1000(meters)

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bradfield Canal A-2 NE(quadrangle 1:24,000 scale)

Bradfield Canal SE(quadrangle 1:100,000 scale)

Bradfield Canal(quadrangle 1:250,000 scale)

Geographic areas

Country State
Canada British Columbia

Commodities

Commodity Importance
Copper Primary
Gold Secondary
Silver Secondary

Materials information

Materials Type of material
Arsenopyrite Unknown
Calcite Unknown
Chalcopyrite Unknown
Chlorite Unknown
Cobaltite Unknown
Galena Unknown
Gold Unknown
Magnetite Unknown
Pyrite Unknown
Pyrrhotite Unknown
Quartz Unknown
Silver Unknown
Sphalerite Unknown
Tourmaline Unknown
Zircon Unknown

Nearby scientific data

Ore Body (1) -130.35177, 56.21647
ListMap

Economic information

Ore body information

  • Strike N20E
    Dip 70E
    Thickness 600M
    Length 760M
    Width 60M
    Area 180HA
    Field Value
    Type of Orebody #1 REPLACEMENT
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 DISSEMINATED
    Shape of Orebody #2 LENTICULAR
    Type of Orebody #3 SHEAR ZONE
    Primary mode of Origin HYDROTHERMAL
    Secondary mode of Origin CONT METASOMATIC
    Primary Ore Control LITHOLOGY
    Secondary Ore Control IGNEOUS
    Degree of Wallrock Alter. MODERATE
    Type of Wallrock Alter. #1 SILICIFICATION
    Type of Wallrock Alter. #2 SERICITIC
    Type of Wallrock Alter. #3 CARBONATE SILIC
    Strike And Dip N20E:70E
    Total Surface Area (HA) 180
    Date of Last Modification 801027

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1951
Year of first production 1971
Milling method Flotation

Mining district

District name Skeena

Mineral rights holdings

Type of mineral rights Patented
Type of mineral rights Located Claim

Ownership information

  • Type Owner
    Owner Granduc Mines Ltd. - Lessor
    Interest 100
    Home office Canada
    Year 1980
  • Type Operator
    Owner Esso Resources Canada Ltd. - Lessee
    Home office Canada
    Year 1980
  • Type Operator
    Owner Cnada Wide Mines Ltd. - Esso Subsidiary Operator
    Home office Canada
    Year 1980

Comments on the ownership information

  • CANADIAN MINES HANDBOOK, 1992-1993, P-175. GRANDUC SOLD ITS INTEREST IN THE SNOWFIELD AND SULPSIDE AREA TO ITS PARTNER IN 1992.

Comments on the production information

  • THE ACTUAL YIELD PERCENT FOR SILVER IS 0.01364 THE ACTUAL YIELD PERCENT FOR GOLD IS 0.00015

Reserves and resources

  • Type In-situ
    Estimate year 1980
    Measured 10886000mt ore
    Demonstrated 10886000mt ore
    Total resources 10886000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 1.7899 wt-pct Copper Major 1980
    Gold Au 0.1 g/mt Gold Minor 1980
    Silver Ag 8.6 g/mt Silver Minor 1980
  • Type In-situ
    Estimate year 1988
    Indicated 9890000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 1.79 wt-pct Copper Major 1988
  • Type In-situ
    Estimate year 1989
    Demonstrated 9890000mt ore
    Total resources 9890000mt ore
    Commodity Subtype Grade units Group Importance Year
    Copper Cu 1.79 wt-pct Copper Major 1989
    Gold Au 0.17 g/mt Gold Minor 1989
    Silver Ag 10.3 g/mt Silver Minor 1989

Comments on the reserve resource information

  • WESTERN MINER, MAY 1980, PP. 23-24. VALUE FOR Q1 RESERVES. GOLDER ASSOCIATES, MAY 20, 1980, GRANDUC REPORT. VALUE FOR Q2 RESERVES. CANADIAN MINES HANDBOOK, 1979-1980, P. 189. VALUE FOR Q3 RESERVES. THE Q2 AND Q3 VALUES HAVE BEEN INCLUDED AS A MATTER OF RECORD. THEY ARE INTENDED TO SHOW DIFFERENT TONNAGES WITH ASSOCIATED FEED GRADES.
  • PERMANENTLY CLOSED AND MILL DISMANTLED FOLLOWING CLOSURE IN APRIL, 1984. ESSO HAS GIVEN UP ALL RIGHTS TO PROPERTY.
  • SOURCE: MR201, CANADIAN RESERVES AS OF JANUARY 1 , 1983. P.20

Workings at the site

  • Type of workings Underground
    Length 4000M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method ESTIMATE
    Mining Method OTHER OPEN STOPE METHODS
    Percent Waste Rock 13
    Percent Recovery 100
    Hardness of Rock HARDROCK WITH LITTLE WATER
    Rock Characteristics UNKNOWN
    Rock Support Chars. UNKNOWN
    Mine Support Chars. UNKNOWN
    Avg. Length of Adits (m) 30692
    Number of Adits 2
    1st Condition of Workings OPEN
    Capacity 3600
    Capacity Units MT ORE/DAY
    Unit Production Cost 8.49
    Units of Production $/MT ORE
    Operating Days per Year 350
    Operating Shifts per Day 3
    Year of Information 1973

Reference information

Bibliographic references

  • Production

    MEYKNECHT, J.J.M., GRANDUC; D.E. PICKETT, ED., IN MILLING

  • Production

    PRACTICE IN CANADA, CIM SPECIAL VOLUME 16, 1978,P.112-113

  • Reserve-Resource

    MR 223, 1989, B.C. 318.

  • Deposit

    B.C. DEPT OF MINES AND PET. RES., G.E.M., 1973, PP. 24, 497.

  • Deposit

    CANADIAN MINES HANDBOOK 1978-79. NEWMONT MINES LTD. P. 202.

  • Deposit

    CRANSTONE, D.A. AND R.T. WHILLANS. CANADIAN RESERVES OF

  • Deposit

    COPPER, NICKEL, LEAD, ZINC, MOLYBDENUM, SILVER AND GOLD,

  • Deposit

    AS OF JAN. 1, 1978. P. 16.

  • Deposit

    ENGINEERING AND MINING JOURNAL. GRANDUC APPROACHES INITIAL

  • Deposit

    PRODUCT STAGE. SEPT. 1970, PP. 109-113.

  • Deposit

    MATTSON, R.S. AND J.A. COX. SUBLEVEL CAVING AND DRAW

  • Deposit

    CONTROL PROCEDURES AT GRANDUC. CIM BULLETIN, APRIL 1973

  • Deposit

    NATIONAL ATLAS OF CANADA, 1969.

  • Deposit

    SKILLINGS. ESSO MINERALS CANADA TO REOPEN GRANDUC COPPER

  • Deposit

    PROPERTY. MARCH 1979, P. 21.

  • Deposit

    WESTERN MINER. GRANDUC MINE TO REOPEN UNDER ESSO AGREEMENT.

  • Deposit

    MARCH 1979, P. 34.

  • Deposit

    WESTERN MINER. GRANDUC PERFORMANCE IMPROVES. JUNE 73, P.52

  • Deposit

    EYLES, N. AND R.G. ROGERSON, CANADIAN MINING JOURNAL, JULY,

  • Deposit

    1977, P.32.

  • Deposit

    WESTERN MINER, MINING OPERATIONS DEPEND ON SNOW-CLEARING

  • Deposit

    IDEA; FEB., 1974, P.46,47.

  • Deposit

    ENGINEERING AND MINING JOURNAL, GRANDUC MAKES ITS MARK IN

  • Deposit

    MINING EVEN BEFORE PRODUCTION STARTS; SEPT., 1969,

  • Deposit

    P.266,267.

  • Deposit

    WESTERN MINER, GRANDUC IMPROVEMENT, AUG., 1973, P.43.

  • Deposit

    WESTERN MINER, GRANDUC OPERATING COMPANY, MAR., 1975, P.32.

Reporter information

Type Date Name Affiliation Comment
Reporter 30-DEC-1994 Porter, Kenneth E. 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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