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Ontario Geological Survey
Permanent Link to this Record:
MDI52E11SE00003
| Record Name(s) | Mikado Reef - 1901, Golden Reef - 1901 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1984-Feb-09 |
| Date Last Modified | 2022-Mar-02 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Snowshoe Bay Area
Latitude: 49° 33' 28.72" Longitude: -95° 2' .3"
UTM Zone: 15 Easting: 352944 Northing: 5491473 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52E11SE
Point Location Description: Shaft location
Location Method: Data Compilation
Circa 1901: extensive surface examination of the Mikado Reef vein. Twenty tons of ore were sent to the Crown Point stamp mill for treatment. 1901-03: The Mikado Reef Mine was sold to the Golden Reef Mining Company and was renamed to the Golden Reef Mine. A 2x2.7 m shaft, inclined 60S, was sunk to a depth of 56 m, with 29 m of lateral work on the 30.5 m level and 42 m of lateral work on the 56 m level. 1982: Selco Inc. conducted magnetic and EM surveys. 1983: BP Resources Canada Ltd. drilled 1 DDH totalling 150 m.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 21 | 52E11SE9096 | 52E11SE9096 |
| 2.5408 | 52E11SE9099 | 52E11SE9099 |
Province: Superior
Subprovince: Wabigoon
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Gabbro | 1 | Sheared |
|---|---|---|---|---|
| Lamprophyre-Unsubdivided | 2 | Dykes | ||
| Ultramafic-Unsubdivided | 3 | |||
| Vein | 4 | Quartz-Carbonate | Host |
May 15, 2020 (Therese Pettigrew) - The island is underlain by the Stevens Island intrusive complex. Thin section studies by Thomson (1935) revealed that basic differentiates such as gabbro, diorite, and amphibolite have locally undergone intense hydrothermal alteration, which locally produced much secondary epidote, ziosite, sericite, carbonate and chlorite. On location D484, medium-grained gabbro is intruded by lamprophyre dikes. On the southeastern side, inclusions of ultramafic rock have been incorporated into the complex. Numerous shear zones are present, most striking between north and east. A fault zone, trending east-northeast, has been interpreted to lie near the northern shore of the island. Movement partly post-dates intrusion of the lamprophyre dikes, which are folded within the shear zone. Numerous quartz-carbonate veins are found throughout the gabbro; vein margins are bleached and strongly chloritized. Quartz appears to be fracture controlled. Vein offsets indicate at least three periods of fracture fill. Pervasive carbonatization, strong silicification and chloritization occur within some shear zones (Davies and Smith, 1988).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Chalcopyrite | Economic | Ore | ||||
| 3 | Gold | Economic | Ore |
Mono - Gold deposits of the Kenora-Fort Frances area, districts of Kenora and Rainy River
Publication Number: MDC016 Scale: Date: 1976
Author: Beard R.C., Garratt G.L.
Publisher Name: Ontario Division of Mines
Location:
MonoMap - Geology of the Shoal Lake-Western Peninsula area, District of Kenora
Publication Number: OFR5242 Scale: Date: 1978
Author: Davies J.C.
Publisher Name: Ontario Geological Survey
Location:
Part - Mines of western Ontario
Publication Number: ARV13-01.005 Scale: Date: 1998
Author: Carter W.E.H.
Publisher Name: Ontario Bureau of Mines
Location:
Mono - The geological setting of gold occurrences in the Lake of the Woods area
Publication Number: OFR5695 Scale: Date: 1988
Author: Davies J.C., Smith P.M.
Publisher Name: Ontario Geological Survey
Location:
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For detailed information regarding this mineral record please contact the Kenora Resident Geologist District Office