Ontario Geological Survey
Permanent Link to this Record:
MDI53B14SE00009
| Record Name(s) | North Caribou River Zn-Ag - 1984 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1995-May-23 |
| Date Last Modified | 2022-Mar-02 |
| Created By | |
| Revised By |
Primary Commodities: Zinc, Gold, Silver
Secondary Commodities: Copper, Lead
Township or Area: Randall Lake Area, Keeyask Lake Area
Latitude: 52° 52' 29.22" Longitude: -91° 11' 5.36"
UTM Zone: 15 Easting: 622163.82 Northing: 5859884.5 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 53B14SE
Point Location Description: Sample locations 73 and 74 on OGS map P2834 and description on p. 66 of OFR5792
Location Method: Conversion from MDI
1984: Showing mapped and sampled by OGS staff. 1985: Moss Resources Ltd. carried out prospecting, mapping, rock and soil sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 53B14SE0020 | 53B14NE0028 | 53B14NE0028 |
Province: Superior
Subprovince: Berens River
Terrane: North Caribou
Domain: North Caribou Core
Belt: North Caribou
Geological Age: Mesoarchean
| Rock Type | Rank | Composition | Texture | Relationship | Intermediate Tuff | 1 | Tuff |
|---|---|---|---|---|
| Gabbroid-Unsubdivided | 2 | Dyke |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Sphalerite | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 3 | Galena | Economic | Ore | ||||
| 4 | Chalcopyrite | Economic | Ore | ||||
| 5 | Pyrrhotite | Economic | Ore | ||||
| 6 | Tetrahedrite | Economic | Ore | ||||
| 7 | Silver | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| 2 | Ankerite | Economic | Gangue | ||||
| 3 | Calcite | Economic | Gangue | ||||
| 4 | Chlorite | Economic | Gangue | ||||
| 5 | Fuchsite | Economic | Gangue |
Aug 16, 2019 (Therese Pettigrew) - A 13 cm wide shear zone mainly mineralized with violet-brown sphalerite, pyrite, galena, chalcopyrite, and tetrahedrite (32.1% Ag) was discovered by this survey on the northwestern shoreline on the largest island in the mouth of the North Caribou River. The shear zone, which strikes 120 and dips 67 NE, and characterized by well-defined deformation banding on clean weathered surfaces, composed of 0.3-2.5 cm wide quartz-brown carbonate layers alternating with 1 to 1.5 cm wide, dark green layers enriched in fine-grained chlorite. The shear zone is localized along a contact between deformed intermediate tuff and tuff breccia and a mafic dyke. Mineralization occurs in two different modes: 1) sphalerite-pyrite-chalcopyrite in quartz-brown carbonate layers concordant to foliation, and 2) galena-pyrite in later, crosscutting, calcite-rich veins (1 mm to 1.5 cm width). All sulphides are mainly fine-grained; only pyrite commonly exceeds grain diameters of 1 to 2 mm. Native silver, as confirmed by X-ray diffraction, Geoscience Laboratories, Ontario Geological Survey, occurs as rare, thin irregular silver to light pink flakes up to 2 by 2 mm on surfaces parallel to foliation and as fine-grained flakes within a 1 by 2 cm ovoid area on a fracture oriented at 650 to foliation. A silver-antimony phase Ag6Sb (15.63 to 15.83% Sb) partly intergrown with pyrite was confirmed by microscope work. Samples returned assays of up to 4.2 g/t Au, 100 g/t Ag, 1800 ppm As, 1000 ppm Cu, 5520 ppm Pb, and 2.5% Zn (Breaks and Bartlett, 1991).
| Rank | Classification |
|---|---|
| 1 | Vein (Polymetallic) |
| Rank | Characteristic |
|---|---|
| 1 | Sheared |
Map - Geological series, Precambrian geology, Eyapamikama Lake area, (Opapimiskan Lake project), Kenora District (Patricia Portion)
Publication Number: P2834 Scale: 1:31,680 Date: 1985
Author: Bartlett J.R., Breaks F.W., de Kemp E.A., Shields H.N.
Publisher Name: Ontario Geological Survey
Location:
Mono - Geology of the Eyapamikama Lake area
Publication Number: OFR5792 Scale: Date: 1991
Author: Breaks F.W., Bartlett J.R.
Publisher Name: Ontario Geological Survey
Location:
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