Ontario Geological Survey
Permanent Link to this Record:
MDI000000001318
| Record Name(s) | Clay Lake Road No. 4 Showing - 2007 |
|---|---|
| Related Record Type | |
| Record Status | Occurrence |
| Date Created | 2011-Nov-15 |
| Date Last Modified | 2021-Nov-23 |
| Created By | Robert Cundari |
| Revised By | Therese Pettigrew |
Primary Commodities: Gold
Township or Area: McComber
Latitude: 49° 38' 1.02" Longitude: -87° 48' 31.51"
UTM Zone: 16 Easting: 441600 Northing: 5498210 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42E12NW
Point Location Description: Assessment report 20000002603
Location Method: Data Compilation
1948: B.L. Morrison carried out prospecting and sampling. 1980: A. Hopkins and E. Harrington carried out a magnetometer survey. 2007: F. Houghton carried out trenching and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.36767 | 20000002603 | 20000002603 |
| 2.3394 | 42E12NW8187 | 42E12NW8187 |
| 63.4130 | 42E12SW0017 | 42E12SW0017 |
Province: Superior
Subprovince: Wabigoon
Belt: Beardmore-Geraldton
Geological Age: Archean
Oct 16, 2019 (Robert Cundari) - The Gwyn Lake property lies entirely within the thickest portion of the western part of the “Southern Metavolcanic Sub-belt”, which marks the southern boundary of the eastern Wabigoon Subprovince (Devaney and Williams 1989). As part of the main Beardmore–Geraldton belt, the Southern Metavolcanic Sub-belt is host to one former producing mine, the Northern Empire (Roxmark Mines Limited), which is situated approximately 10 km southwest and along strike of the Gwyn Lake claim group. From 1934 to 1941, the mine produced 149 493 ounces of gold at a grade of 0.35 ounce gold per ton (Mason and White 1986). The Southern Metavolcanic Sub-belt, which averages 2 to 3 km wide across Summers, McComber and Vincent townships, typically consists of a series of massive to pillowed mafic metavolcanic flows, lesser intermediate tuffs and interflow iron formations. The mafic metavolcanic and flanking sequences within the main belt trend east-northeast. Foliations within the mafic flow units are usually steeply north dipping. The entire sub-belt is interpreted to be an overturned anticlinal structure (Carter 1987). These mafic units are overlain by clastic metasedimentary rocks to the north and separated from locally migmatized metasedimentary sequences of the Quetico Subprovince to the south by the Blackwater River fault zone. The mafic metavolcanic rocks of the Southern Metavolcanic Sub-belt are intruded by semi-conformable feldspar to quartz-feldspar porphyry sills and diorite to gabbro dikes and sills. As documented by Carter (1987) and observed in the field, these dikes are commonly boudinaged and ellipsoidal bodies which range in width from 0.5 to 2 m. Some are sulphide mineralized and anomalous in gold, and as mentioned previously, may be important to local gold metallogeny. Younger, northeast-trending diabase dikes occur throughout the property and a regionally extensive, Mesoproterozoic diabase sheet or sill occurs along the western boundary of McComber Township.
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 |
|---|---|---|---|---|
| Ironstone-unsubdivided | 2 | |||
| Quartz-Feldspar Porphyry | 3 | Quartz-Feldspar | Host | |
| Vein | 4 | Quartz | Host |
Oct 16, 2019 (Robert Cundari) - Units of semi-conformable quartz feldspar porphyry, in places mineralized with 1% to 3% disseminated pyrite, are exposed at the No. 4 East Extension and Blacksmith zone.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Chalcopyrite | Economic | Ore |
Oct 16, 2019 (Therese Pettigrew) - Trenching exposed a quartz vein in a porphyry dyke, in a sheared, mineralized, carbonated mafic metavolcanics. Just north of the shear are deformed pillow lavas. A parallel porphyry dyke has been exposed 7 m south of the vein. This dyke lies in a schistose carbonatized unit. The shear contains pyrite. The vein has minor pyrite and chalcopyrite. Samples returned assays up to 0.71 ppm Au (Assessment report 20000002603). A sample collected in 1948 returned $8.40. Based on $35/oz gold, this converts to 0.24 oz/t Au (8.23 g/t Au) (Assessment report 42E12SW0017).
Mono - Report of Activities 2008, Resident Geologist Program, Thunder Bay North Regional Resident Geologist Report: Thunder Bay North District
Publication Number: OFR6233 Scale: Date: 2009
Author: Smyk M.C., White G.D., Hinz P., Komar C.L.
Publisher Name: Ontario Geological Survey
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