Ontario Geological Survey
Permanent Link to this Record:
MDI52O06SE00006
| Record Name(s) | Jacknife Lake - 1990, Kawashe Lake D - 1990 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1990-Nov-28 |
| Date Last Modified | 2022-Jan-27 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Iron
Township or Area: Kawashe Lake Area
Latitude: 51° 16' 50.13" Longitude: -91° 2' 50.39"
UTM Zone: 15 Easting: 636184.225 Northing: 5682839.396 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52O06SE
Point Location Description: Outcrop
Location Method: Conversion from MDI
Access Description: This occurrence is located about 61 km west-southwest of Pickle Lake and about 13 km south-southeast of the Golden Patricia Mine. This occurrence is an iron formation horizon that outcrops at various locations along the north shore of Jacknife Lake. Access to this occurrence is by appropriately equipped aircraft to Jacknife Lake. The Golden Patricia mine winter road passes about 6 km northeast of this occurrence.
1935: This occurrence was first noted as an iron occurrence by Harding. Sage and Breaks (1982) report that Umex Inc. had a grab sample of the iron formation return an assay result of 0.02 oz/ton Au. 1971: Union Miniere Explorations and Mining Corporation Ltd. commissioned airborne mag and EM surveys and did a reconaissance geological mapping program which covered this occurrence. 1972 and 1973: Union Miniere did diamond-drilling near this occurrence. 1984: St. Joe Canada Inc. did 4 diamond-drill holes, totalling 2177 m, on part of this occurrence. 1985: St. Joe Canada Inc. did ground mag and EM surveys and geological mapping over part of this occurrence. 1985: Dome Exploration (Cda) Ltd. did ground mag and EM surveys over part of this occurrence. 1986: St. Joe Cda. Inc. and Northern Dynasty Explorations Ltd. (for the Ontario Gold Joint Venture) commissioned separate airborne mag and EM surveys over this occurrence. 1987: Dome Exploration (Canada) Ltd. drilled 11 diamond-drill holes, totalling 1432 m, on this occurrence.
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Meen-Dempster
Geological Age: Mesoarchean
Dec 07, 2005 (B Nelson) - The Jacknife Lake occurrence was described by Harding (1935) and later by Sage and Breaks (1982). Both describe a lean iron formation which outcrops on the north shore of Jacknife Lake. Harding suggests that the iron formation horizon may be 30 m to 90 m thick with a strike length close to 5 km. The diamond-drilling done by Dome Exploration (Canada) Ltd. and by St. Joe Canada Inc. indicates that there are multiple iron formation horizons. Some are very lean and others are rich in magnetite. Pyrrhotite and pyrite occur in all the iron formation horizons. The iron formation horizons are part of an east to southeast striking metasedimentary--metavolcanic succession. The metavolcanics range in composition from mafic to felsic and consist of flows and pyroclastic deposits.
| Rock Type | Rank | Composition | Texture | Relationship | Ironstone-unsubdivided | 1 | Iron Formation | Host |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Near | ||
| Felsic lava flow-unsubdivided | 3 | Near | ||
| Terrigenous-Clastic-Unsubdivided | 4 | Metasediments | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Magnetite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Pyrite | Economic | Ore |
Dec 07, 2005 (B Nelson) - Sage and Breaks (1982) report that Union Miniere Explorations and Mining Corporation Limited took 'a grab sample of the Jacknife Lake chert-magnetite iron formation' which assayed 0.02 oz/ton Au. All other reported assays for samples of iron formation from Jacknife Lake are trace gold or nil. This occurrence does not meet the current OGS standard for a gold occurrence. It was named a mineral deposit in a previous compilation because it indicated what the compiler considered to be a slightly anomalous gold value. Newer reports of similar assay values, in the area covered by OFR 5869, have not been included as mineral deposits.
Dec 07, 2005 (B Nelson) - Not known.
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| 2 | Replacement |
| Rank | Characteristic |
|---|---|
| 1 | Stratabound |
Map - Cat Lake-Pickle Lake, geological compilation series, Kenora and Thunder Bay districts
Publication Number: M2218 Scale: 1:253,440 Date: 1976
Author: Sage R.P., Breaks F.W., Troup W.R.
Publisher Name: Ontario Division of Mines
Location:
MonoMap - Geology of the Cat Lake-Pickle Lake area, districts of Kenora and Thunder Bay
Publication Number: R207 Scale: Date: 1982
Author: Sage R.P., Breaks F.W.
Publisher Name: Ontario Geological Survey
Location:
Map - Precambrian geology, Muskegsagagen-Bancroft lakes area, District of Kenora (Patricia Portion)
Publication Number: M2507 Scale: 1:50,000 Date: 1986
Author: Stott G.M., Wilson A.C.
Publisher Name: Ontario Geological Survey
Location:
Part - Geology of the Cat River-Kawinogans Lake area
Publication Number: ARV44-06.002 Scale: Date: 1997
Author: Harding W.D.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Iron deposits of Ontario
Publication Number: MDC011 Scale: Date: 1968
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Mineral Deposits of the Central Portion of Uchi Subprovince, Volume 1, Meen Lake to Kesagiminnis Lake Portion
Publication Number: OFR5869 Scale: Date: 1993
Author: Seim G.Wm.
Publisher Name: Ontario Geological Survey
Location:
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