Ministry of Energy, Northern Development and Mines
Permanent Link to this Record: MDI000000002329| Deposit Name(s) | Fire Lake Dykes - 1969 |
|---|---|
| Deposit Status | occurrence |
| Date Created | 2019-Aug-27 |
| Date Last Modified | 2019-Aug-27 |
| Created By | T Pettigrew |
| Revised By | T Pettigrew |
Primary Commodities: copper, palladium, platinum
Secondary Commodities: nickel
Township or Area: Pickerel Lake Area
Latitude: 48° 43' 41.61" Longitude: -91° 27' 3.46"
UTM Zone: 15 Easting: 613914 Northing: 5398402 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52B11NW
Point Location Description: Western dyke on Figure 1.5 in OFR5997
Location Method: data compilation
Access Description: The western dyke is 13.5 km southeast of Atikokan, 1.6 km north of Nym Lake, 2.15 km east of the Nym Lake Road, and 40 m north of Highway 11. The eastern dyke is 4.3 km southeast of Atikokan, and 1.4 km north of Nym Lake.
1969-70: R. Threw took rock, soil, and vegetation samples over both dykes, and completed VLF-EM in the vicinity of the western dyke. 1991: M. Andrews carried out mapping. 2000: East West Resources Ltd. conducted magnetomter and VLF-EM surveys.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63.6245 | 52B11NE8103 | Open |
| 2.20658 | 52B11NW2001 | Open |
Province: Superior
Subprovince: Quetico
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship |
|---|---|---|---|---|
| ultramafic intrusive | 1 | hornblendeite dyke | host | |
| metasedimentary | 2 | adjacent |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Habit Description |
|---|---|---|---|---|---|---|---|
| 1 | chalcopyrite | economic | ore | ||||
| 2 | pyrrhotite | economic | ore | ||||
| 3 | pyrite | economic | ore |
08/27/2019 (T Pettigrew) - Grab samples collected in 1969 yielded up to 0.55% Cu. The two deformed Fire Lake dykes are about 400 m apart and subconcordantly intrude turbiditic metasediments within 500 m of the irregular migmatitic rim of the Quetico Batholithic Complex. Regional metamorphic grade is mid--amphibolite facies. The western-most dyke is 3 to 4 m thick, was traced in outcrop for about 25 m, and is composed of altered, coarse--grained, locally feldspathic hornblendite containing a small, diffuse sulphide zone of very limited extent. This zone contains 1% finely disseminated chalcopyrite, pyrrhotite, and pyrite that contained 440 ppb Pt, 530 ppb Pd. The eastern-most dyke (located at NAD83 Zone 15, 614646 m E, 5398364 m N) is 20 to 40 m in width and is intermittently exposed along strike for about 650 m. It is composed of coarse, locally biotitic hornblendite and feldspathic hornblendite containing numerous, large, hornblende oikocrysts. Much of the dyke is composed of very coarse-grained appinite with plagioclase-cored, skeletal amphibole crystals up to 5 cm in length and 3 cm in diameter. Purely pegmatitic patches not exhibiting cored, skeletal amphiboles occur locally. One small, diffuse, contact-related sulphide zone was observed. It contains 1 to 2% finely disseminated pyrrhotite and chalcopyrite, with base-and precious-metal contents of 0.13% Cu, 0.15% Ni, 450 ppb Pt, and 99 ppb Pd (MacTavish, 1999).
Publication - The Mafic-Ultramafic Intrusions of the Atikokan–Quetico Area, Northwestern Ontario, p. 14-15
Publication Number: OFR5997 Date: 1999
Author: MacTavish, A.D.
Publisher Name: OGS
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