Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000000142

Record: MDI000000000142

General

Commodities

Primary Commodities: Nickel, Copper

Secondary Commodities: Cobalt, Platinum Metals

Location

Township or Area: Sim Lake Area

Latitude: 51° 4' 58.01"    Longitude: -88° 11' 11.05"

UTM Zone: 16    Easting: 416900   Northing: 5659700    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 52P01SE

Point Location Description: Location obtained from assessment file map.

Location Method: Data Compilation

Exploration History

1970: Addicks Canadian Properties conducted a ground magnetic survey that identified a magnetic high centred over a small mafic intrusion where trenching had previously identified disseminated chalcopyrite and nickeliferous pyrrhotite mineralization. 1995: Trenches were sampled by Golden Trump Resources. Best assays were 0.46% Cu and 0.24% Ni. 1997: Doug Thibault and Basil Smith conducted a program consisting of line-cutting, mag and VLF-EM surveys and prospecting. 1998: mag and VLF-EM surveys, prospecting, stripping and blasting. 1999: Thibault and Smith continued prospecting, stripping, blasting and geological mapping. 2001: Operation Treasure Hunt released lake sediment geochemical surveys which found Sim Lake area contained anomalous values of Ni and Cu. 2002: Thibault and Smith commissioned a petrographic study which assisted in determining the degrees of alteration and mineralogical zonation in the intrusion. 2003: Operation Treasure Hunt released regional airborne mag over the area. 2004: Thibault and Smith conducted a proton magnetometer survey and stripping program which defined the boundaries of the two intrusives on the property. 2006: Channel sampling program; the best results were highs of 2.62% Cu and 2.06% Ni. 2007: channel sampling program.

Assessment Work on File

Geology

Province: Superior

Subprovince: Uchi

Geological Age: Archean  

Geology Comments

Sep 28, 2006 (Mark Puumala) - The occurrence is hosted in a mafic intrusion. The mineralized intrusion consists of two phases, with a gabbro core and an outer zone consisting of pyroxenite. The main intrusion is exposed at surface as an approximately 300 m circular body. A narrow dike-like portion of the mineralized intrusion extends northwest of the main body for a distance of at least 800 m. The intrusion is variably textured, with fine-grained and pegmatitic phases reported by Mason et al. (1999). The mineralized intrusion is hosted within non-mineralized gabbro and granitic migmatites. The surrounding migmatites are highly deformed, with local open folds and variable foliation. However, the mineralized intrusion cross-cuts the migmatites and shows a much lower degree of deformation. Therefore, the emplacement of the mineralized intrusion is interpreted to post-date that of the surrounding migmatites. A late deformation event produced a fabric oriented at approximately 50 to 60 degrees that is filled by thin (2 - 15 cm wide) quartz veins that cross-cut all lithologies.

Lithology

Mineralization

Mineralization Comments

Sep 28, 2006 (Mark Puumala) - Mineralization occurs as disseminated (approximately 1 to 5 %) chalcopyrite, pyrrhotite, pentlandite and pyrite throughout the gabbro and pyroxenite phases. Chlorite alteration was noted by Mason et al. (1999). The best reported assays from this program were reported to contain 0.984% Ni, 0.813% Cu, 0.03% Co and 1.3 g/t PGE. Assay results from samples collected by OGS in 1998 included the following: 3701 ppm Cu, 4345 ppm Ni, 1887 ppm Cr, 181 ppm Co, 0.9 oz/t Ag, 45 ppb Au, 133 ppb Pt and 110 ppb Pd.

Aug 28, 2014 (Therese Pettigrew) - Sampling in 1998 program resulted in anomalous Cu, Ni, Pa and Pt assays with the best results being 3318 ppm Cu, 2332 ppm Ni, 56 ppb Pa and 30 ppb Pt. The 1999 program located new disseminated and net-textured Cu-Ni-Co-Pt-Pa-Au sulphide mineralization and sampling had a best assay of 6396 ppm Cu, 8096 ppm Ni, 200 ppm Co, 668 ppb Pa, 21 ppb Au, 625 ppb Pt, 2 ppm Ag and 1564 ppm Cr.

Mineral Record Details

References

Mono - Report of Activities 1998, Resident Geologist Program, Thunder Bay North Regional Resident Geologist Report: Thunder Bay North and Sioux Lookout Districts

Publication Number: OFR5988 Scale:     Date: 1999

Author: Mason J.K., Seim G.Wm., White G.D., O'Brien M.S., Farrow D.G., Walden A., Komar C.L.

Publisher Name: Ontario Geological Survey

Map - Route map, Lake Nipigon to Albany River, districts of Thunder Bay and Kenora (Patricia Portion), Ontario

Publication Number: ARM38B-02 Scale: 1:253,440    Date: 1997

Author: Burwash E.M.

Publisher Name: Ontario Dept. of Mines

Map - Operation Fort Hope, Attwood-Caribou lakes sheet, districts of Kenora (Patricia Portion) and Thunder Bay

Publication Number: P0564 Scale: 1:126,720    Date: 1997

Author: Thurston P.C., Carter M.W., Riley R.A.

Publisher Name: Ontario Dept. of Mines

Map - Geological highway map, northern Ontario

Publication Number: M2506 Scale:     Date: 1987

Author: Ontario Geological Survey

Publisher Name: Ontario Geological Survey

Map - Fort Hope-Lansdowne House sheet, geological compilation series, Cochrane, Kenora, and Thunder Bay districts

Publication Number: M2237 Scale: 1:253,440    Date: 1972

Author: Thurston P.C., Carter M.W., Riley R.A.

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Map - Geological Compilation of the Miminiska-Fort Hope Area, Eastern Uchi Domain

Publication Number: P3611 Scale: 1:250,000    Date: 2009

Author: Madon Z.B., McIlraith S.J., Stott G.M.

Publisher Name: Ontario Geological Survey

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For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office