Ontario Geological Survey
Permanent Link to this Record:
MDI52F08NW00018
| Record Name(s) | Twilight - 1983 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Feb-27 |
| Date Last Modified | 2022-Jul-06 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Kawashegamuk Lake Area
Latitude: 49° 23' 16.35" Longitude: -92° 27' 30.72"
UTM Zone: 15 Easting: 539295.809 Northing: 5470716.507 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52F08NW
Point Location Description: Transfer
Location Method: Conversion from MDI
Access Description: The area of the Twilight Zone / Snake Bay Project is located some 55 km southeast of Dryden, Ontario. Access to the claim group is via the Snake Bay Road, an all weather gravel road which leads south from Highway 17. This road runs through the middle of the claim group, and a number of logging roads lead off this road providing additional access to the region. The area contains numerous lakes interconnected by short portages or creeks. Virtually all the map area is within a kilometre of a road or navigable lake which greatly facilitates exploration work. (Kenora RGP Assessment File 52F08NW-R-5, Esso Minerals Canada Exploration Activity Report, 1984)
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.7900 / 52F08NW R-2 | 52F08NW8151 | 52F08NW8151 |
Province: Superior
Subprovince: Wabigoon
Terrane: Western Wabigoon
Belt: Eagle-Wabigoon-Manitou
Geological Age: Precambrian
Sep 17, 2009 (D Scholtz) - The claim group is underlain by two stratigraphic groups of supracrustal rocks: the Wapageisi Lake group, and the Stormy Lake group. The metavolcanics of the Wapageisi Lake group comprise a thick sequence of pillowed, mafic volcanics of tholeiitic affinity with thin intercalated horizons of intermediate to felsic calc-alkaline flows and associated interflow sediments (chert/argillite). The sequence is capped by a thick (1 km) sequence of mafic to felsic pyroclastic breccia. Unconformably overlying the Wapageisi Lake group is the Stormy Lake group which consists of a thick (3000 m) succession of coarse polymictic and volcanic conglomerates with thin intercalated rhyolite and basaltic flow horizons.
| Rock Type | Rank | Composition | Texture | Relationship | Mafic pillowed flow | 1 | Pillowed Volcanics Of Tholeiitic Affinity | Contains |
|---|
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Arsenopyrite | Economic | Ore | ||||
| 10 | Pyrite | Economic | Ore |
Jul 06, 2022 (D Scholtz) - Best assay: 6.5 g/t from surface. The Twilight Zone is a triangular (15 x 25 m) shaped area of extensive carbonate veining and irregular sericitized and silicified zones. Channel sampling to date indicates overall low gold values (tr - 6.5 g/t) throughout various alteration facies. The zone itself lies on the eastern edge of the "East Fault Zone" where it intersects the Howie Lake carbonatized zone. Hydrothermal alteration of the Twilight Zone has evolved four distinct zones/facies: (a) quartz-carbonate-sericite-pyrite, (b) silicified py-aspy-bearing zone, (c) massive colliform-textured carbonate vein, and (d) chlorite-carbonate-fuchsite-leucoxene-pyrite schist. A small lens of brecciated carbonate measuring 1.0 x 2.0 metres, containing 5 to 25% pyritized gabbro fragments gave the highest gold values (3 to 6 g/t) on the showing. Silicified, arsenopyrite-bearing material has consistently low Au values (tr - 2 g/t) even though it contains up to 20% pyrite and 10% arsenopyrite as fine-grained disseminations. The alteration zones occur as parallel, north-easterly trending layers which truncate against carbonatized gabbro to the southwest. The western margin of the zone grades into a northerly trending shear zone with the intensity of schistosity increasing towards the west. A number of parallel silicified (quartz-fuchsite-pyrite) pods and lamprophyre/gabbro and monzonite dykes occur in this shear. An intensely carbonatized, vesiculated lamprophyre dyke trending parallel to a 100 foliation cuts across the zone from east to west. Towards the western limit of the zone the dyke shifts to a 030 direction parallel to the north-south shear. As in all other zones on the property, the mafic dykes are intruded into pre-developed structures and hence are intruded late in the structural development of the zones. These dykes, however, are invariably carbonatized and therefore most likely are intruded before or during the peak of carbonate alteration. Drilling of this zone is warranted because of its large size, the intensity of alteration present, and the down dip/plunge potential of the gold bearing zone to widen out based on the apparent obliquity of the hanging wall and footwallcontacts. (Kenora RGP Assessment File 52F08NW-R-5, Esso Minerals Canada Exploration Activity Report, 1984)
Book - KEN AF 52F08NW R-5, (Kenora RGP Assessment File 52F08NW-R-5, Esso Minerals Canada Exploration Activity Report, 1984)
Publication Number: 52F/08NW-R-5 Date: 1996
Author: Moreton, E.P.
Publisher Name: Esso Minerals Canada Ltd.
Location: Kenora Resident Geologist Office
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