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Ontario Geological Survey
Permanent Link to this Record:
MDI52A03SW00013
| Record Name(s) | Naomi Island - 1935, L.K. Johnson - 1973 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1979-Jul-30 |
| Date Last Modified | 2022-Apr-27 |
| Created By | |
| Revised By |
Primary Commodities: Zinc
Secondary Commodities: Copper, Nickel, Silver, Lead
Township or Area: Crooks
Latitude: 48° 1' 41.09" Longitude: -89° 29' 55.06"
UTM Zone: 16 Easting: 313721 Northing: 5322442 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52A03SW, 52A04SE
Point Location Description: Precise
Location Method: Conversion from MDI
Pre-1935: B. Renshaw first reported the vein. No assessment files have been located.
Province: Southern
Formation Group: Animikie Group
Geological Age: Paleoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Gabbro | 1 | Gabbro Dyke | Host |
|---|---|---|---|---|
| Vein | 2 | Carbonate |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Sphalerite | Economic | Ore | ||||
| 3 | Pyrrhotite | Economic | Ore | ||||
| 4 | Galena | Economic | Ore |
Feb 26, 2018 (Therese Pettigrew) - The occurrence of copper-nickel mineralization on Naomi Island was first reported by B. Renshaw (Tanton, 1935). A grab sample collected by OGS staff J. Geul assayed 5% Zn in the form of sphalerite and trace silver. Weakly disseminated copper-nickel mineralization occurs in a sheared and fractured gabbro dyke, 5-15 feet in width, which follows the south shore of the island for a distance of 600 feet. The gabbro dyke is locally porphyritic in texture and is itself intruded by small, parallel, diabase dykelets. Associated with the gabbro dyke is granophyre that appears to have metamorphosed and altered the original mafic constituents of the gabbro dyke. A N-NW-striking, left-handed fault, cemented by calcite, cuts and offsets the mafic intrusions (Geul, 1973).
Mono - Copper, nickel, lead and zinc deposits of Ontario
Publication Number: MDC012 Page: 346 Date: 1969
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology of Crooks Township, Jarvis and Prince locations, and offshore islands, District of Thunder Bay
Publication Number: R102 Page: 22, 28 Date: 1973
Author: Geul J.J.C.
Publisher Name: Ontario Division of Mines
Location:
Publication - Copper-Nickel Mineral Occurrences in Pigeon River Area, Ontario; Geological Survey of Canada, Paper no. 35-1
Publication Number: GSC Paper 35-1 Page: 4 Date: 1935
Author: Tanton, T.L.
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/101044
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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office