GeologyOntario has moved. You will be redirected to the new site in 10 seconds. If you are not immediately redirected please follow the below link to the new GeologyOntario platform. For assistance please contact us.
Ontario Geological Survey
Permanent Link to this Record:
MDI52J14NE00004
| Record Name(s) | Eagle Island - 1957, Lake St. Joseph - 1969, Island 84 - 1922 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Developed Prospect With Reported Reserves or Resources |
| Date Created | 1979-Sep-26 |
| Date Last Modified | 2022-Oct-21 |
| Created By | |
| Revised By |
Primary Commodities: Iron
Township or Area: Trist Lake Area
Latitude: 50° 57' 39.55" Longitude: -91° 2' 49.54"
UTM Zone: 15 Easting: 637144 Northing: 5647302 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52J14NE
Point Location Description: Py occurrence noted on east shore of Eagle Island (Island 84) on map 2442
Location Method: Conversion from MDI
Access Description: Access is by boat to the southwest bay of Lake St. Joseph.
Jabez Williams staked claims over the iron deposits of Lake St. Joseph in the early 1900s. 1921: Ontario Department of Mines Report on Iron Formation of Lake St. Joseph. 1931-32: Consolidated Mining & Smelting Company of Canada Ltd. conducted trenching and drilled 5 DDH. They completed beneficiation studies in July 1932; they concluded that gravity separation would be preferable to flotation. 1956: Antiquois Mining Corp. conducted geological and geophysical surveys (dip needle magnetometer) and trenching. Lake St. Joseph Iron Ltd. drilled the iron deposits from 1957 to 1959 (35 DDH totalling 4,471 m) and contracted Laurier Juteau to compile reserve estimates in 1960/61. 1966-67: Algoma Steel Corp. Ltd. optioned the Gustafson property (SE of Eagle Island), conducted ground magnetic survey and drilled 6 DDH totalling 1315 m. 1968-69: Algoma optioned Lake St. Joseph Iron’s Eagle, Fish and Wolf Islands property and conducted mapping, magnetic and gravity surveys, trench resampling and basic mineralogical studies and test work. 1973: Algoma took a 1100 ton bulk sample from Eagle Island and conducted a pilot metallurgical test. 1974-75: Algoma drilled 71 DDH totalling 14,178.25 m and conducted a ground magnetic survey. 1975: Algoma conducted pilot plant tests, geophysical surveys and reopened old trenches. 1976: Algoma, Stelco and Dofasco selected Eagle Island as the best iron property in NW Ontario for development. 1978-79: Algoma - 3 DDH totaling 428.2 m, geological mapping. 1988: Dofasco acquired Algoma and Lake St. Joseph Iron. 2006: claims lapsed. 2008: Rockex – staked claims and drilled 5 DDH totaling 1312 m. 2011: Rockex - Airborne geophysical survey. 2011-2012: Rockex - 16 DDH totaling 7937.10 m.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.49486 | 20000006839 | 20000006839 |
| 2.40768 | 20000003965 | 20000003965 |
| 52J14NE0011D1 | 52J14NE0011 | 52J14NE0011 |
| 52J14NE0010B1 | 52J14NE0014 | 52J14NE0014 |
| 52J14NE0011A1 | 52J14NE0017 | 52J14NE0017 |
| 52J14NE0012D1 | 52J14NE0009 | 52J14NE0009 |
| 52J14NE0010C1 | 52J14NE0015 | 52J14NE0015 |
| 52J14NE0013E1 | 52J14NE0012 | 52J14NE0012 |
| 52J14NE0013A1 | 52J14NE0010 | 52J14NE0010 |
| 52J14NE0012E1 | 52J14NE0007 | 52J14NE0007 |
| 52J14NE0010A1 | 52J14NE0013 | 52J14NE0013 |
| 52J14NE0012A1 | 52J14NE0016 | 52J14NE0016 |
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Lake St. Joseph
Geological Age: Neoarchean
Aug 28, 2007 (Mark Puumala) - The banded iron formation of Western Lake St. Joseph is hosted within metasedimentary rocks of the Eagle Island Assemblage. Shlanka (1968) indicates that this iron formation extends for an east-west strike length of approximately 10.5 km, and that it attains widths of up to 152 m. The iron formation is described by Clifford (1969) as consisting of alternating laminae of magnetite-rich and quartz-rich material. The iron formation is also reported to contain lesser amounts of biotite, chlorite, epidote, hematite and carbonate. At the far western end of the iron formation, where the metamorphic grade is highest, amphibole and garnet have also been noted. Clifford (1969) indicates that the iron formation has been intensely folded, with one major synclinal structure having been identified. The closure of the main syncline is located along the eastern shore of Eagle Island (see ODM Map 2159), with the northern and southern limbs of the structure forming the northern and southern shorelines of the island (i.e., the axial plane generally strikes east-west). The two limbs of this structure have been mapped to the west across Fish Island, Wolf Island and Island 184.
| Rock Type | Rank | Composition | Texture | Relationship | Ironstone-unsubdivided | 1 | Is |
|---|---|---|---|---|
| Terrigenous-Clastic-Unsubdivided | 2 | Adjacent |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Hematite | Economic | Ore | ||||
| 10 | Magnetite | Economic | Ore | ||||
| 15 | Pyrite | Economic | Ore | ||||
| 20 | Siderite | Economic | Ore |
| Rank | Classification |
|---|---|
| 1 | Sedimentary |
| Rank | Characteristic |
|---|---|
| 1 | Stratabound |
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Eagle Island | 2013 | Inferred Mineral Resource | 108000000 | NI 43-101 Technical report on the preliminary economic assessment on Lake St. Joseph Iron property. Oct 11, 2013 | @ 31.03% Fe. 10% Cut-off Fe | Gold 31.03 Percent |
| Eagle Island | 2013 | Indicated Mineral Resource | 1287000000 | NI 43-101 Technical report on the preliminary economic assessment on Lake St. Joseph Iron property. Oct 11, 2013 | @ 28.39% Fe. 10% Cut-off Fe | Gold 28.39 Percent |
| Eagle Island | 1957 | Inferred Mineral Resource | 204000000 | R070 p. 54 | Tonnage ranges from 125 mt to 225 mt (quoted above) pending pit slope | Iron 35 % |
Map - Western part of Lake St. Joseph, districts of Kenora, Thunder Bay and Patricia, Ontario
Publication Number: ARM31E Scale: 1:63,360 Date: 1997
Author: Bruce E.L.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Miniss Bay sheet, Lake St. Joseph, Kenora and Thunder Bay districts
Publication Number: M2159 Scale: 1:31,680 Date: 1968
Author: Clifford P.M.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Sioux Lookout-Armstrong, geological compilation series, Kenora and Thunder Bay districts
Publication Number: M2442 Scale: 1:253,440 Date: 1981
Author: Breaks F.W.
Publisher Name: Ontario Geological Survey
Location:
Map - Central Lake St. Joseph area (western sheet), District of Kenora
Publication Number: P0229 Scale: 1:15,840 Date: 1997
Author: Clifford P.M.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Iron deposits of Ontario
Publication Number: MDC011 Page: 211 Date: 1968
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology of the western Lake St. Joseph area, Kenora and Thunder Bay districts
Publication Number: R070 Page: 12-16 Date: 1969
Author: Clifford P.M.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Iron formation of Lake St. Joseph
Publication Number: ARV31-08.001 Date: 1998
Author: Bruce E.L.
Publisher Name: Ontario Dept. of Mines
Location:
Publication - NI 43-101 Technical Report on the Preliminary Economic Assessment on Lake St. Joseph Iron Property, Ontario - Canada
Publication Number: 2013 43-101 Date: 2013
Author: Buro, Y.A., Ibrango, S., Cassoff, J., Cunningham, R., Michaud, A. et al.
Publisher Name: Met-Chem Canada Inc. for Rockex Mining Corp
Location: Rockex Mining website
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office