Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42A09SE00037

Record: MDI42A09SE00037

General

Mineral Record Identification
Record Name(s)	Johns-Manville - 1990, Canadian Johns-Manville Co. Ltd. - 1990, McCool-Munro Group - 1990
Related Record Type	Simple
Related Record(s)
Record Status	Occurrence
Date Created	1990-Nov-17
Date Last Modified	2022-Sep-27
Created By
Revised By

Commodities

Primary Commodities: Asbestos

Location

Township or Area: McCool

Latitude: 48° 33' 55.39" Longitude: -80° 6' 23.94"

UTM Zone: 17 Easting: 565908.254 Northing: 5379528.725 UTM Datum: NAD83

Resident Geologist District: Kirkland Lake

NTS Grid: 42A09SE

Point Location Description: Diamond drill hole

Location Method: Conversion from MDI

Access Description: Point Located: A point 3.04 km north and 2.72 km east of the southwest corner of McCool Township. Surface exposures of asbestos consisting of isolated patches of sparsely distributed asbestos veins each of which is less than 0.25 inches in width are reported (assessment files, Resident Geologist's Office, Kirkland Lake) to occur within: a) the southwest quarter of the north half of lot 11, concession IV; b) the southwest quarter of the south half of lot 10, concession IV; c) the west half of the north half of lot 8, concession II; and d) the southeast quarter of the north half of lot 8, concession II. The diamond drilling is reported (assessment files) to have intersected asbestos mineralization within serpentine within: a) the southeast quarter of the north half of lot 11, concession IV; b) the northeast quarter of the south half of lot 11, concession IV; c) the southwest quarter of the north half of lot 11, concession III; d) the north half of the north half of lot 9, concession II; e) the northeast quarter of the north half of lot 7, concession II; f) the northwest quarter of the south half of lot 7, concession III; and g) the southwest quarter of the north half of lot 8, concession III. This occurrence could be further subdivided into 11 individual distinct occurrences but for simplicity is catalogued as one occurrence.

Exploration History

1949- 1950: Canadian Johns-Manville Co. Ltd. completed geological and magnetic surveys and diamond drilled 7 holes totalling 5,250 feet on an 85 contiguous claims in McCool Township. Within these claims, asbestos veinlets less than 0.25 inches in width are exposed on 5 separate claims and diamond drilling on 6 additional claims intersected additional asbestos mineralization.

Geology

Province: Superior

Geological Age: Archean

Metamorphism Grade: Greenschist

Geology Comments

Dec 07, 2005 (C Salo) - Geological mapping (Sutcliffe and Steele 1989; Johnstone 1987; Jensen and Langford 1985; Johnstone and Trowell 1985; Satterly 1953; McClenaghan et al. 1989, 1988, 1987; Steele 1988; Vagners 1984) indicates that most bedrock in western McCool Township is glacial and aeolian deposit covered. Bedrock in the area consists mainly of weakly metamorphosed (greenschist or lower metamorphic facies) subaqueously deposited ultramafic to felsic volcanic rocks of the (Archean) Stoughton-Roquemaure Group and layered mafic-ultramafic sill-like bodies which are hosted by the supracrustal rocks. Bedrock stratigraphy in the occurrence area occupies both limbs of the southeast striking and northwest plunging McCool Hill Syncline. In addition to the layered sill-like bodies, diabase dikes of the (Proterozoic according to Heaman 1989) Matachewan swarm have been identified in the area. A recent geophysical survey of McCool Township (OGS 1984) indicates that coincident anomalous bedrock conductors and a hairpin shaped magnetic anomaly which can be traced continuously around (defines) the closure of the McCool Hill Syncline coincides with the locations of the occurrences. Numerous northeast striking crossfaults across which may be developed tens of metres of apparent horizontal offset have been identified in the area.

Lithology

Lithology Data
Rock Type	Rank	Composition	Relationship
Peridotite	1	Serpentinized Peridotite	Host
Dunite	2	Serpentinized Dunite	Hanging Wall
Mafic lava flow-unsubdivided	3	Basalt	Near

Mineralization

Mineralization and Alteration
Rank	Mineral Name	Class	Economic Mineral Type
1	Magnetite	Economic	Ore
2	Asbestos	Economic	Ore
1	Serpentine	Economic	Gangue
2	Carbonate	Economic	Gangue

Mineralization Comments

Dec 07, 2005 (C Salo) - Geological mapping and diamond drilling by Canadian Johns-Manville Co. identified numerous distinct occur. of asb in western McCool Township. Surface exposures of asb consisting of isolated patches of sparsely distributed asb veins each of which is less than 0.25 inches in width are reported to occur within: a) the southwest quarter of the north half of lot 11, conc. IV; b) the southwest quarter of the south half of lot 10, conc. IV; c) the west half of the north half of lot 8, conc. II; and d) the southeast quarter of the north half of lot 8, conc. II. The diamond drilling is reported to have intersected asb mineralization within serpentine within: a) the southeast quarter of the north half of lot 11, conc. IV; b) the northeast quarter of the south half of lot 11, conc. IV; c) the southwest quarter of the north half of lot 11, conc. III; d) the north half of the north half of lot 9, conc. II; e) the northeast quarter of the north half of lot 7, conc. II; f) the northwest quarter of the south half of lot 7, conc. III; and g) the southwest quarter of the north half of lot 8, conc. III. This occur. could be further subdivided into 11 individual distinct occur. but for simplicity is catalogued as one occur. Asb mineralization which constitutes this occur. (occur.) is hosted by a horizon of serpentinite (most likely serpentinized dunite or serpentinized peridotite) which appears to be conformable in a regional sense. The variably asbestiferous serpentinite produces a pronounced positive magnetic anomaly (caused by the presence of abundant magnetite, a byproduct of the serpentinization process), can be traced indirectly via magnetic surveys, and has been traced directly via diamond drilling for several kilometres along strike around the closure of the McCool Hill Syncline.

Mineral Record Details

References

Map - Black River-Matheson Area

Publication Number: OFM0013 Scale: 1:15,840 Date: 1985

Author: Johnstone R.M., Trowell N.F.

Publisher Name:

Location:

Part - Geology of McCool Township

Publication Number: ARV61-05 Page: 24 Date: 1997

Author: Satterly J.

Publisher Name: Ontario Dept. of Mines

Location:

Folio - McCool Township, District of Cochrane

Publication Number: GDIF380 Date: 1997

Author: Kirkland Lake RGO