Polaris Cornwallis and Little Cornwallis Is.

Producer in Northwest Territories, Canada with commodities Lead, Zinc
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. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Ownership information
  15. Production statistics
  16. Reserves and resources
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. Reporter information

Geologic information

Identification information

Deposit ID 10107329
MRDS ID W018973
Record type Site
Current site name Polaris Cornwallis and Little Cornwallis Is.
Alternate or previous names Arvik Mine

Geographic coordinates

Geographic coordinates: -96.9343, 75.38405 (WGS84)
Elevation 30
Relative position 100 KM EAST OF MAGNETIC NORTH POLE, 100 KM NORTH OF RESOLUTE, ON LITTLE CORNWALLIS ISLAND

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

Geographic areas

Country State
Canada Northwest Territories

Commodities

Commodity Importance
Lead Primary
Zinc Critical Primary

Materials information

Materials Type of material
Dolomite Gangue
Marcasite Gangue
Pyrite Gangue

Alteration

  • (Local) Dolomitization, Marcasite Replacement

Analytical data

Result RESERVES GRADE APPROXIMATELY 15.7% ZN, 3.1% PB

Mineral occurrence model information

Model code 224
USGS model code 32a
Deposit model name Mississippi Valley, S.E. Missouri Pb-Zn
Mark3 model number 42

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Dolomite
    Rock unit name Thumb Mtn. Formation Dolomite And Limestone
    Rock description Thumb Mtn. Formation Dolomite And Limestone
    Stratigraphic age (youngest) Late Ordovician
    Stratigraphic age (youngest) Late Ordovician

Nearby scientific data

(1) -96.9343, 75.38405

Economic information

Geologic structures

Type of structure Local
Structure description Open Folds, Normal And Strike Slip Faults, Thrust Faults, Bedding Plane Slips

Controls for ore emplacement

  • Karst Solution Caverns And Breccias

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Large
Significant No
Discovery year 1970
Discoverer Cominco Ltd.; Showings Found By Bankeno Resources Ltd. In 1960.

Ownership information

  • Type Operator
    Owner Cominco (Exploration And Test Shipments)
  • Type Owner
    Owner Arvik (41% Cominco, 34% Bankeno, 34% Pinepoint Mines Ltd.)

Production statistics

  • Year 1989
    Period 1970-1989
    Material ORE
    Accuracy Accurate
    Description Cp_Grade: ^3.82% Pb, 14.20% Zn, 4.62% Fe
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Ore Iron Iron 5wt-pct
    Ore Zinc Zinc 14wt-pct
    Ore Lead Lead 4wt-pct

Comments on the production information

  • SHIPPING SEASON OPEN 4 TO 6 WEEKS. ONLY PRODUCTION TO DATE HAS BEEN 3266 MT FOR METALLURGICAL TESTS. EXPECT 145,000 T ZN CONC, 32,000 T PB CONC BY 1978/1980. 1990 PRODUCTION ESTIMATED AT AROUND 1 MILLION MT ORE.

Reserves and resources

  • Type In-situ
    Estimate year 1975
    Total resources 22700000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Lead Pb 3.1 wt-pct Lead Major 1975
    Zinc Zn 15.7 wt-pct Zinc Major 1975
  • Type In-situ
    Estimate year 1990
    Total resources 13045000mt ore
    Commodity Subtype Grade units Group Importance Year
    Lead Pb 3.8 wt-pct Lead Major 1990
    Zinc Zn 14.3 wt-pct Zinc Major 1990

Comments on the reserve resource information

  • GROSS METAL VALUE ESTIMATED AT OVER $1.5 BIL.

Workings at the site

  • Type of workings Underground
    Overall depth 550M

Comments on the workings information

  • 1600 M 20 DEG ADIT DECLINE.

Comments on development

  • 125,452 M DRILLED; AVERAGE DEPTH 200 M ; MILL.CAP: 3000 T/D

Reference information

Bibliographic references

  • Deposit

    SANGSTER, D. F., 1974, GEOL. OF CANADIAN PB AND ZINC DEPOSITS, GEOL. SURV. CAN. PAPER 74 - 1A P 141

  • Deposit

    1975, COMINCO CALLS ITS ARCTIC DEPOSITS WORTH MINING, AM METAL MARKET, 9-16-75 P 7

  • Deposit

    CORE SHED DISPLAY APPENDIX, 1990, VIII SYMPOSIUM, INTERNATIONAL ASSOCIATION ON THE GENESIS OF ORE DEPOSITS, OTTAWA, CANADA.

  • Deposit

    1966 DIREXPL COMINCO - EXPLOR. & D D

  • Deposit

    1970 GEOCHEM COMINCO - GEOCHEM & GEOPHYS

  • Deposit

    1972 DIREXPL COMINCO - UNDERGROUND ADIT COMPL. 1973

  • Production

    MINING MAG 4-76 P 331; CORE SHED DISPLAY APPENDIX, 1990.

  • Reserve-Resource

    SKINNER'S MINING INTL YBK 1975 P 174. CANADIAN MINES HANDBOOK 74-75 P 33

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1976 Schruben, Paul G. U.S. Geological Survey
Updater 01-OCT-1990 Bolm, Karen S. U.S. Geological Survey

Beyond USGS

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