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Lac Des Iles

Producer in Ontario, Canada with commodities Copper, Nickel, Gold, Platinum, Palladium
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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. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Ownership information
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10039180
MRDS ID M046737
Record type Site
Current site name Lac Des Iles

Geographic coordinates

Geographic coordinates: -89.58342, 49.25001 (WGS84)
Relative position 55 MILES N. OF THUNDER BAY

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

Geographic areas

Country State
Canada Ontario

Commodities

Commodity Importance
Copper Primary
Nickel Critical Primary
Gold Secondary
Platinum Critical Tertiary
Palladium Critical Tertiary

Materials information

Materials Type of material
Chalcopyrite Ore
Pentlandite Ore
Pyrite Ore
Pyrrhotite Ore
Gold Gangue
Magnetite Gangue
Olivine Gangue
Pyroxene Gangue
Sericite Gangue
Serpentine Gangue
Spinel Gangue
Talc Gangue
Zoisite Gangue

Alteration

  • (Local) Most Intense In Clinopyroxene-Rich Rocks. Alteration Is Deuteric, But Also A Result Of Fluids Mobilized During Eastern Gabbro And/Or Granitic Intrusion. Finally Metamorphosed To Amphibolite-Greenschist Facies.

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
    Stratigraphic age (youngest) Neoarchean
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro > Norite
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Anorthosite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Pyroxenite > Clinopyroxenite

Nearby scientific data

(1) -89.58342, 49.25001
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Economic information

Geologic structures

Type of structure Regional
Structure description Mafic, Ultramafics Of Lac Des Iles Complex, Diabasic Sills And Dikes Intrude E-Ne Striking Granites, Gneisses, Mafic, Intermediate And Felsic Metavolcanic And Metasedimentary Rocks.
Type of structure Local
Structure description Western Gabbroic Unit Layered By Accumulation.

Ore body information

  • Strike S20E
    Dip 50 TO 85E
    Length 914.4M
    Width 30.48M
    Depth to bottom 152.4M

Comments on the geologic information

  • LAC DES ILES COMPLEX COMPOSED OF 2 UNITS: NORTHERN ULTRAMAFICS (PERIDOTITE, CLINOPYROXENITE, WEBSTERITE, GABBRO) AND SOUTHERN GABBROS, DIVIDED INTO EAST AND WEST UNITS. WESTERN UNIT SULFIDE-RICH AND PEGMATITIC. EASTERN UNIT OXIDE-RICH WITH SULFIDE-POOR NORITES AND GABBROS. FIELD EVIDENCE SHOWS WESTEN GABBROS EMPLACED FIRST, THEN EASTERN GABBROS, FINALLY ULTRAMAFICS.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Significant No
Discovery year 1974
Discoverer Sheridan Geophysics Ltd.

Ownership information

  • Type Owner-Operator
    Owner Boston Bay Mines

Comments on the reserve resource information

  • MOUNT FOR POT. RESERVES 35,000 MET. TONS/VERTICAL METER.

Comments on the workings information

  • OPEN ON BOTH ENDS

Reference information

Bibliographic references

  • Deposit

    LAC DES ILES PT - PD : THE NORTHERN MINER, FEB. 12 , 1976 ; OCT. 21 , 1976 , V. 62 , NO. 32 AND OCT. 28 , 1976

  • Deposit

    WATKINSON AND DUNNING, 1979, GEOLOGY AND PT. GROUP MINERALIZATION, LAC DES ILES COMPLEX, NW ONTARIO: CANADIAN MINERALOGIST, VOL. 17 PP. 453-562.

  • Deposit

    1976 DIREXPL BOSTON BAY MINES LTD.

  • Deposit

    1976 DIREXPL TEXASGULF

General comments

Subject category Comment text
Deposit BOSTON BAY MINES OWNED, 40 % OWNED BY BELTERRE

Reporter information

Type Date Name Affiliation Comment
Reporter 01-APR-1976 Blair, Will N. U.S. Geological Survey
Updater 01-MAR-1980 Oster, Karel L. U.S. Geological Survey

Beyond USGS

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

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