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  3. Mineral Resource Data System (MRDS)

Mount Brussilof

Producer in British Columbia, Canada with commodity Magnesite
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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. Host and associated rocks
  8. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Ownership information
  12. Reserves and resources
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10106739
MRDS ID I000411
Record type Site
Current site name Mount Brussilof
Alternate or previous names Baymag

Geographic coordinates

Geographic coordinates: -115.91777, 51.04988 (WGS84)
Location accuracy 1000(meters)
Relative position Estimated Location, Precision May Be Poor.

Site location context

Political divisions (FIPS codes)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

Geographic areas

Country State
Canada British Columbia

Comments on the location information

  • DEPOSIT CROPS OUT ALONG THE WEST FLANK OF MOUNT BRUSSILOF AND TO THE NORTH ON THE RIDGE BETWEEN MITCHELL RIVER AND ASSINIBOINE CREEK.

Commodities

Commodity Importance
Magnesite Primary

Materials information

Materials Type of material
Magnesite Ore
Calcite Gangue
Dolomite Gangue
Quartz Gangue

Analytical data

Result QUARTZ GRAINS FORM 1-3% OF MAGNESITE ROCK ON AVERAGE, BUT MAY CONSITUTE AS MUCH AS 10% LOCALLY. SURFACE SAMPLING IN 1969-- COARSE-GRAINED MAGNESITE OF BED A: 46.83% MGO, 0.53% CAO, 0.14% SIO2, 51.29% CO2, 0.10% AL2O3, 0.94% FE2O3, 0.17% INSOLUBLES
Result MEDIUM-FINE GRAINED CRYSTALLINE MAGNESITE OF BED B: 47.02% MGO, 0.49% CAO, 0.09% SIO2, 51.52% CO2, 0.10% AL2O3, 0.77% FE2O3, 0.02% INSOLUBLES
Result MAIN ORE ZONE: 46.48-47.01% MGO, 0.43-0.55% CAO, 0-0.10% SIO2, 51.44-51.82% CO2, 0.10% AL2O3, 0.80% FE2O3, AND 0.06-0.28% INSOLUBLES. MOST OF THE INSOLUBLE WAS BASO4.

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Dolomite
    Rock unit name Cathedral Formation
    Rock description Cathedral Formation
    Stratigraphic age (youngest) Middle Cambrian
    Stratigraphic age (youngest) Middle Cambrian

Nearby scientific data

(1) -115.91777, 51.04988
ListMap

Economic information

Ore body information

  • Thickness 120M
    Length 790M
    Width 500M

Comments on the geologic information

  • THE DOLOMITE IS SANDY TO ARGILLACEOUS, FINE GRAINED, AND LIGHT TO DARK GRAY IN COLOR. THE CATHEDRAL FM IS 370 M THICK.

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Significant No
Year of first production 1982

Ownership information

  • Type Owner-Operator
    Owner Baymag Mines Ltd.

Reserves and resources

  • Type In-situ
    Estimate year 1987
    Total resources 13600000000mt ore
    Commodity Subtype Grade units Group Importance Year
    Magnesite MgO 93 wt-pct Magnesium Major 1987

Reference information

Bibliographic references

  • Deposit

    HAMILTON, W.N., AND HORA, Z.D., 1987, OPPORTUNITIES EXIST FOR INDUSTRIAL MINERALS DEVELOPMENT IN BRITISH COLUMBIA AND ALBERTA: MINING ENGINEERING, V. 39, NO. 12, P. 1061-1067

  • Reserve-Resource

    HAMILTON & HORA, 1987.

General comments

Subject category Comment text
Deposit MAGNESITE OCCURS IN A THICK SECTION OF SANDY TO ARGILLACEOUS DOLOMITES. THE MAGNESITE FORMS MASSIVE 50 TO 100 M THICK, IRREGULAR LENTICULAR BODIES IN WHICH THE BEDDING IS RARELY SEEN. NORTH OF ASSINIBOINE CREEK, MAGNESITE LIES ON THE WEST DIPPING LIMB OF A BROAD ANTICLINE. ON THE NORTH FLANK OF MOUNT BRUSSILOF, 2 DISTINCT HORIZONS OF HIGH CAO MAGNESITE, SEPARATED BY 100 M OF DOLOMITE, ARE EXPOSED. THE MAGNESITE IS A WHITE TO GRAYISH, VERY COARSE GRAINED CRYSTALLINE ROCK. IT IS QUITE RESISTANT, WEATHERS TO A LIGHT BUFF COLOR, AND FORMS PROJECTIONS AND OVERHANGING CLIFFS. THIS DEPOSIT IS REPUTED TO BE THE LARGEST AND PUREST, COARSE CRYSTALLINE MAGNESITE DEPOSIT IN THE WESTERN WORLD. IN 1987, THE DEPOSIT WAS DEFINED AS AN AREA ABOUT 790 M BY 500 M ON A NORTHWEST AXIS WITH A MAXIMUM THICKNESS OF 120 M.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-OCT-91 Orris, Greta J. U.S. Geological Survey

Beyond USGS

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

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