Ontario Geological Survey
Permanent Link to this Record:
MDI42D11NE00004
| Record Name(s) | Lambton Cove Occurrence - 1918, Copper Harbour - 1991, Lampton Cove - 1991 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Apr-01 |
| Date Last Modified | 2022-Sep-27 |
| Created By | |
| Revised By |
Primary Commodities: Copper, Zinc
Township or Area: Slate Islands Area
Latitude: 48° 41' 1.53" Longitude: -87° 1' 36.79"
UTM Zone: 16 Easting: 498020.997 Northing: 5392301.999 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42D11NE
Point Location Description: Adit
Location Method: Conversion from MDI
Access Description: This occurrence is located on the eastern side of Lambton Cove (Copper Harbour) of Mortimer Island in Lake Superior about 11 km south of the town of Terrace Bay.
A tunnel, constructesd by person(s) unknown, is located on the eastern side of Lambton Cove (Copper Harbour). This tunnel was driven at lake level into a sulphide showing and was reported by Parsons (1918) to have been designed to test a copper showing. The sulphide zone on which the adit was driven appears to cut through the hill and outcrop in the southern side of the bay in the northeastern corner of Copper Harbour. At this point the sulphide zone is 15 m in width and consists of disseminated to almost massive pyrite. The adit is 18 m long and has a waterfilled winze 3 m deep. 1985: The Slate Islands were designated a Provincial Park and withdrawn from staking.
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Schreiber-Hemlo
Geological Age: Archean
Dec 07, 2005 (B Schnieders) - Sage (1983, p.211) desribes the occurrence: 'One well exposed sulphide occurrence occurs on the east side of Lambton Cove and has been a subject to testing by persons unknown. Grab samples of massive sulphides taken by the field party from the adit returned 0.11 percent copper and 0.28 percent zinc. In the cliff face northeast of the adit, massive and disseminated sulphide are present. This zone is 15 m wide with a 2.5 m band of argilliteon the south flank containing the richest accumulation. The exposure is highly sheared and could not be traced to the top of the cliff face. The zone consists dominantly of brecciated mafic metavolcanics.
Apr 21, 2011 (B Nelson) - The occurrence is classed as a 'volcanic-hosted copper' deposit. One well exposed sulphide occurrence is located on the east side of Lambton Cove and has been subject to testing by persons unknown. In the cliff face northeast of the adit, massive and disseminated sulphide are present. This zone is 15 m wide with a 2.5 m band of argillite on the south flank containing the richest accumulation. The exposure is highly sheared and could not be traced to the top of the cliff face. The zone consists dominantly of brecciated mafic metavolcanics. The mineralization is generally erratic in distribution within the metavolcanics and the principal concentration is within the argillite. The argillite bedding appears to strike due east and dip vertically. The argillite soils the fingers and is presumed graphitic in nature. Within the argillite a zone of pyrite concretions 50 cm wide contains flattened speroids of the sulphide, Some of these structures display a finely crystalline core with a coarsely crystalline rim of about 0.5 m thickness. The iron sulphide speroids are up to a maximum 1.5 by 3.0 cm in size. The Lambton Cove sulphide occurrence is typical of the very minor sulphide bearing exposures found on Mortimer Island.
| Rock Type | Rank | Composition | Texture | Relationship | Mudstone | 1 | Graphitic Argillite | Sheared | Host |
|---|---|---|---|---|
| Mafic flow breccia | 2 | Brecciated | Host |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore |
Dec 07, 2005 (B Nelson) - Low values of copper and zinc (i.e. 0.11% Cu and 0.28% Zn) were obtained from grab samples.
Dec 07, 2005 (B Nelson) - Not known.
Map - Nipigon-Schreiber, geological compilation series, Thunder Bay District
Publication Number: M2232 Scale: 1:253,440 Date: 1973
Author: Carter M.W., McIlwaine W.H., Wisbey P.A.
Publisher Name: Ontario Division of Mines
Location:
Part - Slate Islands, Lake Superior
Publication Number: ARV27-01.004 Page: 155-167 Date: 1998
Author: Parsons A.L.
Publisher Name: Ontario Bureau of Mines
Location:
Map - Geological series, Slate Islands, District of Thunder Bay
Publication Number: P0997 Scale: 1:15,840 Date: 1975
Author: Sage R.P., Treacher K.W., Meloche D., Bathe D.
Publisher Name: Ontario Division of Mines
Location:
Map - Precambrian geology, Slate Islands
Publication Number: M2523 Scale: 1:10,000 Date: 1991
Author: Sage R.P.
Publisher Name: Ontario Geological Survey
Location:
Mono - Geology of the Slate Islands
Publication Number: OFR5435 Page: 211 Date: 1984
Author: Sage R.P.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Precambrian geology, Slate islands
Publication Number: R264 Date: 1991
Author: Sage R.P.
Publisher Name: Ontario Geological Survey
Location:
Mono - Mineral Occurrences in the Nipigon-Marathon Area, Volumes 1 and 2.
Publication Number: OFR5951 Date: 1996
Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.
Publisher Name: Ontario Geological Survey
Location:
File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files, Thunder Bay office
Publication Number: Min Dep Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
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