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Ontario Geological Survey
Permanent Link to this Record:
MDI42L11NW00009
| Record Name(s) | Stewart Lake - 1970, Skibi Lake Iron Occurrences - 1970 |
|---|---|
| Related Record Type | Partial |
| Related Record(s) | |
| Record Status | Prospect |
| Date Created | 1991-Jan-23 |
| Date Last Modified | 2022-Jul-20 |
| Created By | |
| Revised By |
Primary Commodities: Iron
Township or Area: Stewart Lake Area
Latitude: 50° 42' 50.97" Longitude: -87° 20' 35.6"
UTM Zone: 16 Easting: 475768.64 Northing: 5618095.1 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42L11NW
Point Location Description: Transfer
Location Method: Based on Assessment
1957-58: Panther Mining Company Limited – airborne geophysics. 1958-59: Sulmac Exploration Services Ltd. – DD-2-722 ft 1961: Stewart Lake Iron Mines – DD-2-1212 ft, bulk sample
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 11 | 42L11NW0007 | 42L11NW0007 |
| 19 | 42L11NW0013 | 42L11NW0013 |
| 12 | 42L11NW0001 | 42L11NW0001 |
Province: Superior
Subprovince: English River
Terrane: English River Basins
Belt: Melchett Lake
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Ironstone-unsubdivided | 1 | Host |
|---|---|---|---|---|
| Claystone | 2 | Argillite | Adjacent | |
| Gneiss-Unsubdivided | 3 | Biotite | Adjacent |
Aug 15, 2014 (A Wilson) - The Stewart Lake-Skibi Lake occurrences consist of two bands of iron formation, the main one which extends approximately 31 miles from east of Tennant Lake to the Little Current River on the east. The second band is found only in the Melchett Lake area - it extends over a strike length of about 8 miles. The two bands are separated by about 2,000 feet of biotite quartz- feldspar schist (metagreywacke). The older, smaller band consists of "cyclic layers of magnetite, schist, and often quartz". The major unit has a basal band of iron formation separated from an upper, higher grade band by 50-150 feet of biotite-quartz-feldspar schist. The iron formation bands themselves vary from 100 to 400 feet thick in the Melchett Lake area. They are coarsely to finely layered, oxide-facies iron formation with magnetite-rich beds up to 12-18 inches thick and quartzite or cherty interbeds up to 8 to 10 inches thick where observed. As one proceeds eastwards along strike, the two bands of iron formation grade from oxide facies to sulphide facies.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Hematite | Economic | Ore | ||||
| 2 | Magnetite | Economic | Ore |
Aug 15, 2014 (A Wilson) - Hematite is more abundant, and the magnetite-hematite ratio of 2:1 The iron formation is bounded by sedimentary rocks. Pegmatites are not abundant. The formation is relatively continuous, but as a series of lenses connected by thinner bands. Mill testing of a 500 lb sample returned a concentrate averaging 62-64% Fe, 7% SiO2
| Rank | Characteristic |
|---|---|
| 1 | Concordant |
Mono - Operation Fort Hope
Publication Number: MP042 Page: 22, 55-56 Date: 1970
Author: Thurston P.C., Carter M.W.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Map - Compilation series, Ogoki Lake sheet, Thunder Bay and Cochrane districts
Publication Number: P0274 Scale: 1:126,720 Date: 1997
Author: Stott G.M., McConnell C.D., Mason J.K.
Publisher Name: Ontario Geological Survey
Location:
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For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office