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Ontario Geological Survey
Permanent Link to this Record:
MDI52A06SW00002
| Record Name(s) | Loch Lomond - 1887 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1979-Aug-02 |
| Date Last Modified | 2022-Mar-04 |
| Created By | |
| Revised By |
Primary Commodities: Silver
Township or Area: Blake
Latitude: 48° 15' 49.79" Longitude: -89° 18' 20.34"
UTM Zone: 16 Easting: 328892.89 Northing: 5348194.28 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52A06SW
Point Location Description: Precise
Location Method: Conversion from MDI
Access Description: Access may be gained through the Fort William Reserve road 1.75 km from the junction of 61B and City Road south of the Kam River. Head south on the road, and at the fork turn right. Proceed to the gate. Follow the road south that parallels the water pipeline and then a trail breaks off this. Follow south to the head of the Lomond River.
1887: Silver was reportedly found on the eastern shores of Loch Lomond. 1900: a shaft was sunk at the head of the Lomond Rover to a depth of 4.9 m by an American syndicate. 1923: Discovered by T.L. Tanton of the Geological Survey of Canada.
Province: Southern
Formation Group: Animikie Group
Geological Age: Paleoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Diabase | 1 | Diabase Sill |
|---|---|---|---|---|
| Terrigenous-Clastic-Unsubdivided | 2 | |||
| Vein | 3 | Host |
Feb 28, 2018 (Therese Pettigrew) - Diabase sills overlie shales and mudstones. The sills exhibit polygonal jointing.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Argentite | Economic | Ore | ||||
| 2 | Chalcopyrite | Economic | Ore | ||||
| 3 | Galena | Economic | Ore | ||||
| 4 | Pyrite | Economic | Ore | ||||
| 5 | Sphalerite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue |
Feb 28, 2018 (Therese Pettigrew) - Sergiades (1968) reported the presence of native silver and cobalt arsenides. The top of a diabase sill is exposed in nearly horizontal attitude 1.2 m above lake-level. The exposed surface measures approximately 84 square metres and is divided into irregular polygonal blocks by a contraction-crack structure, which resembles mud-crack structure. The polygons are from 7.6 to 15.2 cm in diameter; the contraction cracks are 0.63 to 1.25 cm in width and are cemented by white crystalline quartz, crustified on the walls, producing a comb structure. Along the median part of one such veinlet, 1.25 cm in width, argenite was found through a distance of 7.6 cm (Tanton, 1931). An assay recorded in the Daily Sentinel on Oct 31, 1887 showed $40 worth of silver to the ton (based on $0.98/oz Ag, this would be about 40.8 oz/t Ag).
| Rank | Classification |
|---|---|
| 1 | Vein |
| Rank | Characteristic |
|---|---|
| 1 | Vein |
Mono - Silver cobalt calcite vein deposits of Ontario
Publication Number: MDC010 Scale: Date: 1968
Author: Sergiades A.O.
Publisher Name: Ontario Dept. of Mines
Location:
Publication - Fort William and Port Arthur, and Thunder Cape Map-area, Thunder Bay District, Ontario; Geological Survey of Canada, Memoir 167
Publication Number: GSC Memoir 167 Scale: Date: 1931
Author: Tanton, T.L.
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/100799
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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office