Ontario Geological Survey
Permanent Link to this Record:
MDI53C07NW00024
| Record Name(s) | G. Desmeules Property - 1968 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1983-Dec-21 |
| Date Last Modified | 2022-Jun-14 |
| Created By | |
| Revised By |
Primary Commodities: Copper, Nickel
Secondary Commodities: Cobalt
Township or Area: Hewitt Lake Area
Latitude: 52° 25' 58.19" Longitude: -92° 46' 32.61"
UTM Zone: 15 Easting: 515247.57 Northing: 5809204.25 UTM Datum: NAD83
Resident Geologist District: Red Lake
NTS Grid: 53C07NW
Point Location Description: Precise
Location Method: Data Compilation
1968: G. Desmeules - staking. 1969: Noranda Exploration Company Limited - DD-1-106 m
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63.2519 | 53C07NE0003 | 53C07NE0003 |
| 53C07NW0015 | 20000004861 | 20000004861 |
| 12 | 53C07NW0506 | 53C07NW0506 |
Province: Superior
Subprovince: Sachigo
Terrane: North Caribou
Belt: North Spirit Lake
Geological Age: Archean
May 23, 2007 (Mark Puumala) - The most notable structural feature in the southern portion of the North Spirit Lake Greenstone Belt is the Bear Head Fault Zone. This is a northwest-striking, regional-scale, dextral strike-slip structure that extends for approximately 515 km from Lake Winnipeg in the northwest to the north boundary of the Meen-Dempster Greenstone Belt in the southeast (Osmani and Stott (1988). Wood (1980) indicates that this deformation zone, which he refers to as the Favourable Lake-McDowell Lake Fault Zone, forms the western boundary of the greenstone belt. According to Osmani and Stott (1988), this fault zone is approximately 3 km wide in the McDowell Lake area at the south end of the North Spirit Lake Greenstone Belt. Wood (1980) has identified a minimum of six discrete faults within the fault zone that are characterized by extensive shearing and mylonitization. Wood (1980) has also identified a number of additional northwest-striking fault zones farther to the east within the central portions of the greenstone belt. These structures may represent splays related to the main Bear Head Fault Zone, and include the Wokokotai Lake and Roseberry River Faults. Wood (1980) has also identified a number of northeast-striking faults in the area. Two major isoclinal folds (South Bay Syncline and Hewitt Lake Anticline) having northwest-trending axes have been identified to the south of North Spirit Lake by Wood (1980). Wood (1980) also suggests the presence of a number of northeast-trending cross-folds to the south of North Spirit Lake. As is typical for most Archean-age greenstone belts in Ontario, the dips of stratigraphic marker horizons and foliation in the area south of North Spirit Lake is near-vertical (Wood 1980). Although the structural complexity of the area has resulted in variable bedding and foliation strike directions, mapping by Wood (1980 and 1988) indicates that orientations of these features are typically subparallel and that the dominant stike direction is northwest. These observations are not surprising given the presence of a major northwest-striking fault zone and northwest-trending isoclinal folds in the area
| Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Host |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 1 | Adjacent | ||
| Conglomerate | 3 | Conglomerate | Adjacent |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Magnetite | Economic | Ore | ||||
| 4 | Chalcopyrite | Economic | Ore | ||||
| 5 | Arsenopyrite | Economic | Ore |
May 23, 2007 (Mark Puumala) - Wood (1980) describes the mineralization at this location as occurring at the contact between mafic metavolcanic rocks to the north and conglomerate to the south. Mineralization occurs in narrow veins within a shear zone that parallels the lithologic contact, which is indicated on OGS Map 2408 to strike approximately 115 degrees. Mineralization consists of pyrite, pyrrhotite, magnetite, chalcopyrite and arsenopyrite. A grab sample collected from the surface expression of this occurrence by Wood (1980) assayed 0.06% Cu and 0.15% Co. Diamond drilling of the occurrence by Noranda Exploration in 1969 (AFRI# 53C07NW0506) resulted in the following assays: 0.27% Cu and 0.08% Ni over 0.76 m; 0.34% Cu and 0.05% Ni over 0.76 m; and 0.67% Cu over 0.9 m. Anomalous assays were consistently obtained over a core interval of approximately 60 m across the lithologic contact (Wood 1980).
| Rank | Classification |
|---|---|
| 1 | Vein |
| Rank | Characteristic |
|---|---|
| 1 | Vein |
MonoMap - Geology of the Hewitt Lake area, District of Kenora (Patricia Portion)
Publication Number: R186 Page: 110-111 Date: 1981
Author: Wood J.
Publisher Name: Ontario Geological Survey
Location:
Map - Hewitt Lake, Kenora District
Publication Number: M2408 Scale: 1:31,680 Date: 1979
Author: Wood J., Hunter A.D.
Publisher Name: Ontario Geological Survey
Location:
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