Ontario Geological Survey
Permanent Link to this Record:
MDI42E16NW00008
| Record Name(s) | Pitton - 1969 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Feb-05 |
| Date Last Modified | 2023-May-25 |
| Created By | |
| Revised By |
Primary Commodities: Niobium, Thorium
Township or Area: O'Meara
Latitude: 49° 56' 1.87" Longitude: -86° 16' 6.19"
UTM Zone: 16 Easting: 552504.4 Northing: 5531532.62 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42E16NW
Point Location Description: Transfer
Location Method: Conversion from MDI
Access Description: Drive 12 km east from Longlac on Trans-Canada Highway 11, turn north onto Lukinto Lake Road and drive for about 20 km. A seasonal trailer camp is situated on the shore of Chipman Lake, with a road leading to it.
1960-63: prospectors employed by Kimberley-Clark explored for mineralization related to the carbonatite dykes. 1974: International Minerals and Chemicals examined the area for phosphate potential. No evidence for phosphate accumulations was found. 1992: property was staked by G. Royer, who conducted geological mapping, soil geochemical sampling and a VLF-EM survey. 1993: Royer conducted a radiometric survey. 1995: Roy conducted VLF-EM and magnetometer surveys, mapping and prospecting.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| W9540-00198 | 42E16NE0012 | 42E16NE0012 |
| 2.14908 | 20000005104 | 20000005104 |
| OP93-231 | 42E16NE0013 | 42E16NE0013 |
| OP92-243 | 42E16NW0002 | 42E16NW0002 |
Province: Superior
Subprovince: Wabigoon
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Monzonite | 1 | Monzonite |
|---|---|---|---|---|
| Schist-Unsubdivided | 2 | |||
| Carbonatite-Unsubdivided | 3 | Host |
Oct 10, 2017 (Therese Pettigrew) - The Chipman Lake area is dominated by metavolcanics interbedded with minor metasediments and intruded by various granitoids. East of Chipman Lake, a strong magnetic anomaly has been interpreted by some as a carbonatite intrusion, though Sage (1985) suggests that it is due to a magnetite-bearing syenodiorite stock. Large areas of granitic rock lie east of the map area, with pegmatites and aplites of granititc composition cutting both the metavolcanics and syenodiorite. Carbonatite dykes mainly of dolomitic composition and generally less than a metre wide are common on the west shore of the Lake. The carbonatites are spatially associated with a major fault that passes through the centre of Chipman Lake and which is interpreted to be part of the fault zone that transects the east edge of Killala alkali complex to the Coldwell complex on Lake Superior. This regional fault is the northern extension of the Big Bay-Ashburton fault with traverses the Lake Supeior Basin in a NE direction. A lateral displacement of 0.8 km along this fault has been suggested. It is characterized by alkali rock and carbonatitic magmatic activity. The carbonatite and diabase dykes appear to be of Proterozoic age and are the youngest rocks in the area (AFRI 42E16NE0012).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Columbite | Economic | Ore | ||||
| 2 | Tantalite | Economic | Ore | ||||
| 3 | Magnetite | Economic | Ore | ||||
| 4 | Pyrite | Economic | Ore | ||||
| 1 | Dolomite | Economic | Gangue | ||||
| Carbonate | Alteration | Carbonatization | 1 | Strong | Massive |
Oct 10, 2017 (Therese Pettigrew) - Carbonatite dykes occur on the very edge of Chipman Lake and are particularly prominent on the southwest edge of it. They very in width from a few cm up to a 2 m, with the longest traceable for 7 m. The dykes are usually constituted of pure carbonate-dolomite, though tiny trains of magnetite and columbite are often common. The carbonatites are usually allied with the fenitized monzonites. Along the lakeshore, carbonate alteration is often so pervasive that surfaces of Chipman stock have a rough, jagged, clinkery appearance. The carbonatite is mainly equigranular and fine grained. The brownish weathering surfaces indicate that the dolomite is ferruginous. During a brief radiometric survey in 1993, it and other adjacent dykes yielded slightly radioactive values of 500-800 counts per second. A sample from here assayed almost 0.1% niobium and thorium. Tiny specks of a blackish mineral (possibly columbite and thorianite) were noted (AFRI 42E16NE0012). During the 1992 soil sampling program, up to 100-260 ppm barium, 60 ppm lanthanum, 393 ppm strontium, 144 ppm zinc, and 102 ppm nickel was found (AFRI 20000005104).
Map - Caramat sheet, districts of Cochrane, Thunder Bay and Algoma, geological compilation series
Publication Number: P0551 Scale: 1:126,720 Date: 1997
Author: Innes D.G.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Geology of carbonatite-alkalic rock complexes of Ontario, Chipman Lake area, districts of Thunder Bay and Cochrane
Publication Number: S044 Date: 1985
Author: Sage R.P.
Publisher Name: Ontario Geological Survey
Location:
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