Ontario Geological Survey
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MDI53C07NW00026
| Record Name(s) | McDonald Occurrence - 1957 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1984-Jan-31 |
| Date Last Modified | 2022-Mar-02 |
| Created By | |
| Revised By |
Primary Commodities: Lead, Zinc, Silver
Secondary Commodities: Gold
Township or Area: Hewitt Lake Area
Latitude: 52° 23' 25.18" Longitude: -92° 45' 47.6"
UTM Zone: 15 Easting: 516113.16 Northing: 5804479.57 UTM Datum: NAD83
Resident Geologist District: Red Lake
NTS Grid: 53C07NW
Point Location Description: Precise
Location Method: Data Compilation
1957: A. H. McDonald carried out pitting and drilled 3 DDH totalling 87.66 m. 1969: Noranda Exploration Company Ltd. carried out airborne magnetic and EM surveys, and drilled 2 DDH totalling 157.6 m. 1987: Petromet Resources carried out geophysical and geological surveys, prospecting, sampling, and drilled 2 DDH totalling 258.47 m.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 53C07NW0008 | 20000004864 | 20000004864 |
| 23 | 53C07NW0500 | 53C07NW0500 |
| 10 | 53C07NW0024 | 53C07NW0024 |
| 63.4293 | 53C07NE0006 | 53C07NE0006 |
| 63.2519 | 53C07NE0003 | 53C07NE0003 |
| 53C07NW0004 | 20000015697 | 20000015697 |
Province: Superior
Subprovince: Sachigo
Terrane: North Caribou
Belt: North Spirit Lake
Geological Age: Archean
Oct 10, 2018 (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 | Diorite | 1 | Diorite | Near |
|---|---|---|---|---|
| Siltstone | 1 | Sulphidic Argilllite | Contains |
Nov 20, 2014 (Mark Puumala) - Wood (1980) indicates that this occurrence is located at a contact between sheared metasedimentary rocks to the northeast and a diorite intrusion to the southwest. The shear zone is likely related to the Roseberry River Fault, which is shown on ODM Map 2408 to be coincident with the metasedimentary/intrusive rock contact. The interpreted faulted contact is shown to have a strike azimuth of approximately 325 in this area. The occurrence is reported by Brereton (1987) to be exposed at surface in three large trenches and a number of smaller pits over a strike-length of approximately 40 m. The bedrock that was exposed in the pits has been interpreted to be metasedimentary in origin, and includes black fine-grained argillaceous material, para-amphibolite and siliceous material of unknown origin.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrrhotite | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 3 | Sphalerite | Economic | Ore | ||||
| 4 | Galena | Economic | Ore | ||||
| 5 | Arsenopyrite | Economic | Ore |
Nov 20, 2014 (Mark Puumala) - Brereton (1987) describes two types of mineralization at this location. The first consists of 1 to 10% pyrite, pyrrhotite and arsenopyrite as stringers and disseminations in argillite and chert. The second type of mineralization occurs in an approximately 1 m wide zone in sheared sedimentary rocks that contains foliation-parallel sphalerite-galena stringers. Diamond drilling of the occurrence by Scurry-Rainbow Oil in 1968 is reported by Wood (1980) to have encountered similar mineralization at depth. Brereton (1987) reports grab sample assay values of up to 10 oz/ton Ag, 10% Pb, and 3.5% Zn from the sphalerite-galena stringer zone. Assay values of up to 3.72 oz/ton Ag over 0.6 m and 0.02 oz/ton Au were reported from the 1968 Scurry-Rainbow diamond drilling. Additional drilling carried out at this location in 1969 logged the metasedimentary rock sequence as consisting of argillite, amphibolite, argillite-quartzite, argillite-conglomerate and banded magnetite iron formation (Wood 1980). The most notable assay reported from the 1969 drilling program was 0.9 oz/ton Ag over 1.5 m.
Oct 10, 2018 (Therese Pettigrew) - Assays up to 5600 ppm Zn over 0.4 m were reported from a sulphidic argillite with 3-4% pyrite in DDH NS87-2 (AFRI 53C07NW0500).
| Rank | Classification |
|---|---|
| 1 | Vein (Polymetallic) |
| Rank | Characteristic |
|---|---|
| 1 | Sheared |
Mono - Geology of the Hewitt Lake area, District of Kenora (Patricia Portion)
Publication Number: OFR5216 Scale: Date: 1977
Author: Wood J.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Geology of the Hewitt Lake area, District of Kenora (Patricia Portion)
Publication Number: R186 Scale: 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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