Ontario Geological Survey
Permanent Link to this Record:
MDI52E09SW00042
| Record Name(s) | Allie Island Copper Occurrence - 9999 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 2000-Mar-24 |
| Date Last Modified | 2022-Jun-16 |
| Created By | |
| Revised By |
Primary Commodities: Copper
Township or Area: Yellowgirl Bay Area
Latitude: 49° 35' 25.03" Longitude: -94° 26' 30.77"
UTM Zone: 15 Easting: 395790.812 Northing: 5494076.853 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52E09SW
Point Location Description: Approximate location based on description in ARV20 p. 175-176
Location Method: Data Compilation
1911: exploration work including 3 shafts by F.W. Moore.
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | chloritic | sheared | Host |
|---|
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Copper | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore |
Jun 16, 2022 (Therese Pettigrew) - From Parsons (1911): "On June 5th, having received supplementary instructions to examine the reported discovery of copper on Allie island, Lake of the Woods, I visited the claims on this island which have been taken up by F. W. Moore. These copper locations are on the south side of the island and are in a decomposed rock which consists principally of chlorite or serpentine. On exposure to the air this rock looks like lime or marl, and resembles the serpentine from Hoboken, New Jersey, and the decomposed serpentine from Lancaster county, Pennsylvania. On first examining this rock no trace of copper was to be seen, but on crushing and panning the crushed material, small pellets, and crystals of copper were obtained. The crystals which are found are invariably octahedral in form, and vary in size from mere grains up to one-fourth of an inch in diameter. The chloritic rock in which the copper occurs is apparently the result of the decomposition of a diabase with which it is in contact, and some specimens when broken open exhibit a nucleus of comparatively fresh diabase with an outer zone of the chloritic rock. A search was made for sulphides in the diabase but without success, although a few small specks too minute to be identified in the field were found, which resemble pyrrhotite. Four claims had been staked out, and two shafts about twenty feet deep had been sunk. The amount of copper found in the rock up to that time was apparently not sufficient to be of economic value. A second visit was made on September 1st. During the summer a new shaft about forty feet deep had been sunk near the more promising of the earlier shafts, and at this depth the rock was still soft and chloritic. On going down into the shaft a considerable improvement was noted in the character of the ore. The mine is just west of French Narrows, about 14 miles from Kenora. From King (1973): A native copper occurrence located on Allie Island, Lake of the Woods, was examined during the year. The mineralization consists of native copper in highly sheared basalt that has been altered to a soft, rusty, somewhat chloritic material giving the appearance of a weathered shale. The east-west-trending zone is estimated to be about 60 to 70 feet wide and dips vertically. Panning, by the author, of the weathered rock produced a number of small fragments and one octahedral crystal of native copper. The largest piece recovered was about 1.5 cm in length. Overburden and the lake have obscured the extent of the mineralized zone but it would appear to extend from the shore eastward for about 300 feet where it is truncated by a north-northeasterly trending diabase dike.
Article - Kenora District
Publication Number: MP054.001 Page: 14 Date: 1998
Author: King H.L.
Publisher Name: Ontario Division of Mines
Location:
Part - Gold fields of Lake of the Woods, Manitou and Dryden
Publication Number: ARV20-01.006 Page: 175-176 Date: 1998
Author: Parsons A.L.
Publisher Name: Ontario Bureau of Mines
Location:
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