Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42D16NE00003

Record: MDI42D16NE00003

General

Commodities

Primary Commodities: Asbestos

Location

Township or Area: Cirrus Lake Area

Latitude: 48° 53' 27.18"    Longitude: -86° 14' 17.83"

UTM Zone: 16    Easting: 555835.05   Northing: 5415605.6    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 42D16NE

Point Location Description: Precise

Location Method: Conversion from MDI

Exploration History

1953: Canadian Johns-Manville Company Ltd. conducted a geological and magnetometer survey. 1968: Mexico Exploration (Canada) Ltd. carried out a SP survey and soil sampling. 1969: Mexico Exploration (Canada) Ltd. drilled 3 DDH totalling 351.1 m.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Schreiber-Hemlo

Geological Age: Archean  

Lithology

Mineralization

Mineralization Comments

Mar 16, 2018 (Therese Pettigrew) - The showing is in a large U-shaped serpentine body which intrudes the metavolcanics. The main showing consists of a narrow outcrop varying in width from 0.6-3.7 m and exposed over a length of 29.5 m. The serpentine is medium green in colour and medium grained in texture. Fracturing, striking in various directions is prevalent in the serpentine and forms a semi-cross cross pattern. A few of these veins consist of carbonated pseudo fibre, others are filled with white carbonated material, and the remainder are mineralized with crysotile asbestos. Biebre is associated with shearing which strikes N9E and has a near vertical dip. Shearing appears to be local and can only be traced for a few metres along strike. The serpentine is relatively homogenous and consists mainly of black to dark green serpentinized dunite that is rust brown to buff on the weathered surface. The rock has a characteristically honey comb texture consisting of 0.3-0.6 cm dark green to black polygonal grains in a white or light blue-green interstitial mesh. The polygonal grains appear to be pseudomorphed euhedral olivine grains replaced by antigorite serpentine. The original olivine grain outlines are defined by a thin interstitial mesh of crysotile serpentine or carbonate. No recognizable layering was noted in the serpentine. Asbestos and magnetite concentrations in narrow gash vein zones were the only mineralizations found within the serpentine. The main zones all contain excellent strong and silky fibre with veins up to 1.2 cm in width. The fibre in outcrops surrounding the main showing occurs as thread veins and veins up to 0.3 cm in width (Vos and Smith, 1983).

Mineral Record Details

References

MonoMap - Geology of Cirrus Lake-Bamoos Lake area, District of Thunder Bay

Publication Number: R043 Scale:     Date: 1997

Author: Milne V.G.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Asbestos in Ontario

Publication Number: IMR036 Scale:     Date: 1998

Author: Vos M.A.

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Location:

Mono - Industrial minerals of northern Ontario-supplement 2

Publication Number: OFR5439 Scale:     Date: 1983

Author: Vos M.A., Smith V.

Publisher Name: Ontario Geological Survey

Location:

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Ministry Contact Information

For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office