Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42D16SW00031

Record: MDI42D16SW00031

General

Commodities

Primary Commodities: Granite

Location

Township or Area: McCoy

Latitude: 48° 46' 30.4"    Longitude: -86° 24' 25.37"

UTM Zone: 16    Easting: 543565   Northing: 5402626    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 42D16SW

Point Location Description: Test block location on map in Assessment file 42D12SW8193

Location Method: Data Compilation

Access Description: GENERAL LOCATION: The property is located 500 m south of Highway 17 in central McCoy Township approximately 7.0 km north-northwest of Marathon (Figure 23). ACCESS: The property can be accessed by a gravel road departing south from Highway 17 at a point approximately 5.2 km west from the turn-off to Marathon.

Exploration History

1985: Noranda Inc. carried out mapping and evaluation. 1989: Cold Spring Granite Canada Ltd. drilled 10 DDH totaling 173.2 m.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (W Bellinger) - GENERAL GEOLOGY AND STRUCTURE: The claims are underlain by Fe-rich augite syenite (Walker et al. 1992) of the Proterozoic Coldwell alkalic complex. Geological mapping over the area was done by Puskas (1967) and recently by Walker et al. (1991, 1992, 1993). Walker et al. (1992) described the iron-rich augite syenite as follows: The iron-rich augite syenite appears to be a low angle sheet-like intrusion, which dips approximately 15 degrees toward the centre of the complex. It intrudes the basaltic xenoliths of the roof pendant and the Eastern and Western Gabbro, and it has inclusions of recrystallized amphibole quartz syenite. A variation in mineralogy from the bottom to the top through the sheet is present and consists of: fayalite-iron-rich, augite-magnetite syenite; iron-rich augite syenite; fayalite-iron-rich augite syenite; and amphibole syenite.

Lithology

Lithology Comments

Dec 07, 2005 (W Bellinger) - Walker et al. (1992) described the mineralogy of the iron-rich augite syenite: Iron-rich augite syenite, which forms the majority of the intrusion, typically contains iridescent tabular to lath-shaped feldspars with cryptoperthitic intergrowths and up to 30% interstitial, iron-rich augite. Variable amounts of fayalite, amphibole, aenigmatite and rare quartz occur in the subunit. The rock is generally black to olive-brown, coarse grained and massive. COLOUR: The stone is black to olive-brown with some greenish sections in fresh cut surfaces. TEXTURE: The stone is generally coarse grained.

Mineralization

Mineralization Comments

Dec 07, 2005 (W Bellinger) - MINERALOGY: Walker et al. (1992) described the mineralogy of the iron-rich augite syenite: Iron-rich augite syenite, which forms the majority of the intrusion, typically contains iridescent tabular to lath-shaped feldspars with cryptoperthitic intergrowths and up to 30% interstitial, iron-rich augite. Variable amounts of fayalite, amphibole, aenigmatite and rare quartz occur in the subunit. The rock is generally black to olive-brown, coarse grained and massive. COLOUR: The stone is black to olive-brown with some greenish sections in fresh cut surfaces. TEXTURE: The stone is generally coarse grained. PHYSICAL PROPERTIES: Bulk Specific Gravity: 2.738 % Absorption 2 hrs.: 48 hrs.: 0.560 Compressive Strength: 20,130 (psi) dry 18,420 (psi) wet Modulus of Rupture: 1,420 (psi) dry 1,530 (psi) wet Tests done by Twin City Testing Corp., St. Paul, Minnesota (Assessment Files, Thunder Bay).

Mineral Record Details

References

Book - SURV OF GEOL AND GEOMORPH OF NEYS PROV PARK,ENV PLAN SERIES,MNR

Publication Number: RPT Date: 1974

Author: Billings, M.D.

Publisher Name:

Location: Thunder Bay RGP

Map - Port Coldwell area, District of Thunder Bay

Publication Number: P0114 Scale: 1:31,680    Date: 1997

Author: Puskas F.P.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Dimensional Stone Occurrences and Deposits in Northwest Ontario

Publication Number: OFR5890 Page: 124-127  Date: 1994

Author: Hinz P., Landry R.M., Gerow M.C.

Publisher Name: Ontario Geological Survey

Location:

Map - Precambrian Geology, Port Coldwell Complex, East Half

Publication Number: P3233 Scale: 1:20,000    Date: 1993

Author: Walker E.C., Sutcliffe R.H., Shaw C.S.J., Shore G.T., Penczak R.S.

Publisher Name: Ontario Geological Survey

Location:

Mono - Building stones of Ontario, part 5, granite and gneiss

Publication Number: IMR019 Page: 36-38  Date: 1997

Author: Hewitt D.F.

Publisher Name: Ontario Dept. of Mines

Location:

Publication - A Contribution to the Petrology of the Coldwell Alkaline Complex; Geological Survey of Canada, Bulletin 287

Publication Number: GSC Bull 287 Date: 1980

Author: Currie, K.L.

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/106630

MonoMap - Geology of the Port Coldwell area, District of Thunder Bay

Publication Number: OFR5014 Date: 1997

Author: Puskas F.P.

Publisher Name: Ontario Dept. of Mines

Location:

Article - Geology of the Coldwell alkaline complex

Publication Number: MP157.018 Date: 1998

Author: Walker E.C., Sutcliffe R.H., Shaw C.S.J., Shore G.T.

Publisher Name: Ontario Geological Survey

Location:

Article - Geology of the Port Coldwell alkalic complex

Publication Number: MP160.019 Page: 108-120  Date: 1997

Author: Walker E.C., Sutcliffe R.H., Shaw C.S.J., Shore G.T., Penczak R.S.

Publisher Name: Ontario Geological Survey

Location:

Report an Error

We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.

Terms of Use

Please review our Terms of Use agreement for this data product.

Ministry Contact Information

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