Ontario Geological Survey
Permanent Link to this Record:
MDI52G15SE00006
| Record Name(s) | Sassafras Lake SW - 1957 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1995-May-30 |
| Date Last Modified | 2022-Mar-02 |
| Created By | |
| Revised By |
Primary Commodities: Iron
Secondary Commodities: Gold, Zinc
Township or Area: Dunne Lake Area
Latitude: 49° 51' 8.17" Longitude: -90° 34' 50.33"
UTM Zone: 15 Easting: 673909.93 Northing: 5525012.95 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52G15SE
Point Location Description: Location of DDH 4 & 5 on map in Assessment report 52G15SE0004
Location Method: Based on Assessment
1956: N. A. Timmins Exploration Ltd. carried out prospecting. 1957: N. A. Timmins Exploration Ltd. conducted ground magnetometer and dip needle surveys, an aeromagnetic survey, and drilled 8 DDH totalling 1330.8 m. 1961: Steep Rock Iron Mines Ltd. carried out a magnetometer survey. 2010: Excalibur Resources Ltd. carried out soil gas hydrocarbon surveys, mapping, and drilled 2 DDH totalling 476.1 m.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 52G15SE0010A1 | 52G15SE0004 | 52G15SE0004 |
| 52G15SE G-0013 | 52G15SE0018 | 52G15SE0018 |
| 2.48954 | 20000006201 | 20000006201 |
| 2.45924 | 20000006493 | 20000006493 |
Province: Superior
Subprovince: Wabigoon
Belt: Sturgeon Lake
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Ironstone-unsubdivided | 1 | Host |
|---|---|---|---|---|
| Syenite | 2 | Near | ||
| Mafic lava flow-unsubdivided | 3 | Near | ||
| Intermediate Tuff | 4 | Graphitic Tuff | 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 | ||||
| 4 | Arsenopyrite | Economic | Ore | ||||
| 5 | Sphalerite | Economic | Ore | ||||
| 6 | Chalcopyrite | Economic | Ore | ||||
| 1 | Graphite | Economic | Gangue |
Jan 30, 2020 (Therese Pettigrew) - Shklanka (1968) describes the occurrence as “Discontinuous, easterly-trending magnetite-quartz iron formation bands with a strike length of 14 miles in Archean metasedimentary schists and gneiss intruded by syenite. Some pyrite and pyrrhotite locally” and “West of Sassafras Lake, preliminary reserve estimates of possible open pit ore, 200 to 500 feet in width and 300 feet in depth, range from 22.3 million tons capable of producing 7.4 million tons of concentrate grading 69% Fe, 3-4% SiO2, to 44 million tons, grading 23-24% mag. Fe, capable of producing 15 million tons of concentrate grading 66% Fe, 5% SiO2.” Drill holes 4 and 5 from 1957 proved that the anomalous area is 400 feet (122 m) wide and made up of 195’ (59.4 m) at 25.35% Fe, 105’ (32 m) of barren syenite, and 100’ (30.5 m) at 30.34% Fe (Assessment report 52G15SE0018). Excalibur Resources’s DDH SL-10-18 intersected 2 magnetite-rich lenses grading 25.0% Fe over 7.09 m and 21.7% Fe over 42.82 m. Abundant diorite, monzodiorite, and syenite dykes were encountered in these zones, with up to a quarter of the core drilled through the iron formation being comprised of dyke material. DDH SL-10-02 intersected a disseminated to stringer sulphide zone that contained 12.8 m averaging 86.6 ppb Au (including 1.28 m averaging 0.42 g/t Au). SL-10-02 also encountered a graphitic tuff containing sphalerite that assayed 0.18% Zn over 1.11 m (Assessment report 20000006201).
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| Sassafras Lake | 1968 | Unclassified | 20230114 | MDC011 p. 435 | 22.3 million tons capable of producing 7.4 million tons of concentrate grading 69% Fe, 3-4% SiO2 |
MonoMap - Geology of the Metionga Lake area, districts of Thunder Bay and Kenora
Publication Number: R024 Scale: Date: 1997
Author: Rogers D.P.
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:
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