Ontario Geological Survey
Permanent Link to this Record:
MDI41I07NE00003
| Record Name(s) | Coulis Garnet Property - 1927 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Prospect |
| Date Created | 1990-Dec-13 |
| Date Last Modified | 2022-Feb-23 |
| Created By | |
| Revised By |
Primary Commodities: Garnet (Nonmetals)
Township or Area: Dill
Latitude: 46° 24' 43.86" Longitude: -80° 49' 21.78"
UTM Zone: 17 Easting: 513625.143 Northing: 5139860.721 UTM Datum: NAD83
Resident Geologist District: Sudbury
NTS Grid: 41I07NE
Point Location Description: Mineral occurrence at surface symbol (Map, GDIF068)
Location Method: Conversion from MDI
Access Description: The showing is located on patented mining claims within Lot l, Con. IV, Dill Township. The potential ore is reported to straddle the north-south CNR railway into Lot 2, Con. IV. The mineralized zone, adjacent to the Cleland batholith may be reached by walking 3.2 km north along the CNR right-of-way from St. Cloud Station off Highway 537. The outcrop described is located to the east of both the Wanapitei River and the adjacent railway track. (OFR5329, p. 130)
1914: The rocks of this garnetifierous deposit were first described by A.P. Coleman. 1926: T.T. Quirke later identified and traced the ore unit by mapping garnet deposits in the Rutter Map area. 1927: V.L. Eardley-Wilmot (ARV1927, p.17) reports that the property was staked by Louis L. Coulis of Sudbury and that several "shots" had been placed in the rock. Since then the property has received no reported attention, excepting entry on the map by S.B. Lumbers (1975) (OFR5329, p. 130, 131)
Province: Southern
Subprovince: Sudbury Structure
Supergroup: Sudbury Igneous Complex, Main Mass
Geological Age: Paleoproterozoic
Jun 04, 2009 (D Scholtz) - Garnet, the parent name for a family of complex alumina silicates has a distinctive pattern of occurrences within biotitic gneisses and schists adjacent to and south of the Grenville Front Boundary Fault zone. Considerable industrial research has been performed on garnet deposits associated with kyanite in the area, particularly with reference to separation of the ore minerals and demand for garnet as an abrasive. The Coulis deposit in Dill Township contains garnet in a biotite schist. Numerous inclusions of quartz, hornblende and chlorite in the garnets has led to the abandonment of this property. The genesis of these garnets is attributed to the metamorphic reaction of biotite gneiss in contact with granite pegmatite dikes. (OFR5329, p. 122) The garnetiferous biotite gneiss is noticeable on a southern outcrop beside the railway track. Here the mineralized rock interfingers southward with conformable non-garnetiferous biotite gneiss. Prior to pinching out the narrowing band of gneiss is sandwiched between a stratigraphically higher quartzose gneiss and the stratigraphically lower non-garnetiferous biotite gneiss. All units strike N45°E and dip 35°SE. The garnets in this locality are subhedral almandine crystals up to 5 cm diameter with a prominence of quartz inclusions. They compose 10% to 15% of the rock on visual estimation and are associated with a much lesser amount of kyanite. To the north, a second outcrop displays a thickening of the garnetiferous band and simultaneous disappearance of the quartzose gneiss. The contact of the garnetiferous unit with the lower non-garnetiferous unit is abrupt and marked by decrease in size of mica grains to a fine grained non-garnetifierous biotite gneiss. Foliation of both units is consistent with foliation noted in the southern showing. Both units are cut by dominant well zoned granite pegmatite dikes measuring several feet wide with uniform orientation of a N97°E strike and 36°N dip. The garnets in the northern showing are subhedral crystals measuring 1.3 cm in diameter, constituting 15% of the rock by sight. (OFR5329, p. 130)
| Rock Type | Rank | Composition | Texture | Relationship | Schist-Unsubdivided | 1 | Kyanite-Garnet-Biotite-Muscovite Schist | Host |
|---|---|---|---|---|
| Gneiss-Unsubdivided | 2 | Metawacke (Garnetiferous, Biotite-Quartz Gneiss) | Host |
Jun 04, 2009 (D Scholtz) - Wanapetei Mafic Igneous Complex; Flow-foliated igneous breccia, agmatite, commingled gabbroic and granitic rocks. In contact with Huronian Supergroup derived supracrustal rocks comprising of mainly well-layered biotite-garnet gneiss, migmatitic in part, and intercalated locally with kyanite-garnet-biotite-muscovite schist. (OF4570, 2005, GSC)
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Garnet | Economic | Ore | Network |
Jun 04, 2009 (D Scholtz) - Migmatic Biotite Gneiss; fine, medium to coarse-grained metawacke,(garnetiferous, biotite-quartz-plagioclase gneiss) and thickly bedded, intraformational metaconglomerate containing containing meta-arkose fragments in a metawacke matrix. (M2491, 1:50 000 Sudbury Compilation) The garnets are consistently euhedral to subhedral with a predominance of quartz-inclusions. Grade varies from 10% to 15% (visual estimates) of the rock and garnets are mostly less than 1.0 centimetres in diameter. Additional mineralization was not noticed to the north or east, but a reported occurrence is located to the west on the opposite bank of the Wanapitei River. (OFR5329, p.130)
Map - Broder, Dill, Neelon and Dryden townships, District of Sudbury
Publication Number: M2017 Scale: 1:31,680 Date: 1997
Author: Phemister T.C., MacGregor I.D., Grant J.A., Pearson W.J., Thomson J.E., Bowie G.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Industrial minerals of the Sudbury area
Publication Number: OFR5329 Scale: Date: 1981
Author: Vos M.A., Smith B.A., Stevenato R.J.
Publisher Name: Ontario Geological Survey
Location:
Map - Burwash, Nipissing, Parry Sound, and Sudbury districts
Publication Number: M2271 Scale: 1:126,720 Date: 1974
Author: Lumbers S.B.
Publisher Name: Ontario Division of Mines
Location:
MonoMap - Geology of Broder, Dill, Neelon, and Dryden Townships and Kyanite Occurrences in Dryden Township
Publication Number: R009 Scale: Date: 1962
Author: Grant J.A., Pearson W.J., Phemister T.C., Thomson J.E.
Publisher Name: Ontario Geological Survey
Location:
Folio - Dill Township, District of Sudbury
Publication Number: GDIF068 Scale: Date: 1997
Author: Sudbury RGO
Publisher Name: Ontario Geological Survey
Location:
Map - Sudbury geological compilation, Sudbury District, Sudbury Regional Municipality
Publication Number: M2491 Scale: 1:50,000 Date: 1984
Author: Dressler B.O.
Publisher Name: Ontario Geological Survey
Location:
Map - Geology, Sudbury bedrock compilation, Ontario
Publication Number: OF 4570 Scale: 1:50,000 Date: 2005
Author: Ames, D E; Davidson, A; Buckle, J L; Card, K D
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/221501
Folio - Dill Township, District of Sudbury
Publication Number: GDIF068 Scale: Date: 1997
Author: Sudbury RGO
Publisher Name: Ontario Geological Survey
Location: Mines Library, Sudbury; Geology Ontario
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