Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52P04NE00013

Record: MDI52P04NE00013

General

Commodities

Primary Commodities: Iron

Location

Township or Area: Achapi Lake Area

Latitude: 51° 8' 46.2"    Longitude: -89° 32' 31.19"

UTM Zone: 16    Easting: 322202.43   Northing: 5669151.9    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 52P04NE

Point Location Description: Precise

Location Method: Conversion from MDI

Exploration History

1968: Diamond drilling by Sturdy Mines carried out geological mapping, magnetic and EM surveys, and drilled 6 DDH totalling 1592 m. 1972: Ground magnetic and electromagnetic surveys by Sturdy Mines. 1977-78: Diamond drilling (10 DDH totalling 294.1 m) and ground magnetometer survey by Algoma Steel. 1988: BHP-Utah Mines carried out HLEM, magnetometer, and VLF-EM surveys.

Assessment Work on File

Geology

Province: Superior

Subprovince: Uchi

Terrane: North Caribou

Domain: Uchi

Belt: Lake St. Joseph

Geological Age: Neoarchean  

Geology Comments

Nov 09, 2006 (Mark Puumala) - The rocks in the vicinity of the Misehkow River iron occurrence are located in a metavolcanic and metasedimentary belt described by Sage and Breaks (1982) as the Pashkokogan Lake-Misehkow River Belt. This belt is bounded to the north by Granitoid rocks of the Kagami Pluton and Seach-Achapi Lakes Granitoid Complex (Stott 1996), and to the south by the metasedimentary migmatites of the English River Subprovince. The rocks in the immediate area of the occurrence are dominated by mafic metavolcanics (pillowed and massive flows). The mafic volcanics are also reported to be intercalated with felsic volcanic flows, tuffs and lapilli tuffs. Diamond drill hole information interpreted by Sage and Breaks (1982) indicate that the iron formation is generally bounded on both sides by thinly-bedded metasedimentary rocks consisting of thinly-bedded, graphitic, often siliceous greywacke and sericitic quartzite. Stott and Corfu (1991) have interpreted the boundary between rocks of the 2750-2730 Ma Confederation Assemblage and 2723-2713 Ma St. Joseph Assemblage to be located approximately coincident with the course of the Misehkow River in the vicinity of this occurrence. Confederation assemblage rocks are located to the north, and are dominated by mafic metavolcanics, while the St. Joseph Assemblage rocks are located further to the south and include mafic and felsic metavolcanics and metasedimentary rocks. The Misehkow occurrence is located in rocks interpreted to be part of the St. Joseph Assemblage. Sage and Breaks (1982) indicate that bedding and foliation orientations in the Pashkokogan Lake-Misehkow River Belt are generally parallel. Most foliations mapped by Sage and Breaks (1982) on the vicinity of this occurrence dip steeply to the north, with an approximate average strike orientation of 240. A synclinal axis trending parallel to foliation has been interpreted by Sage and Breaks (1982) immediately south of the occurrence. Shearing (likely parallel to the axial plane of the fold) has also been noted parallel to the Misehkow River.

Lithology

Mineralization

Mineralization Comments

Nov 09, 2006 (Mark Puumala) - The characteristics of the Misehkow River iron prospect were inferred by Sage and Breaks (1982) from diamond drill hole logs prepared by Sturdy Mines (i.e., the deposit does not outcrop at surface). The iron formation consists of uniform, well-bedded chert-magnetite layers with minor hematite and sulphide minerals. The iron formation deposit outlined by Sturdy Mines varies in thickness from 48 to 155 m, and covers a minimum strike-length of 1630 m (i.e., it is open to the east and west). Sturdy Mines is reported by Sage and Breaks (1982) to have outlined a 64,555,000 tonne deposit at this location that grades 21% Fe.

Apr 26, 2021 (Therese Pettigrew) - Sturdy Mines Ltd. have outlined by drilling an iron deposit having an indicated tonnage of 71,160,000 with a grade of 21.0% iron (total Fe) over a strike length of 5350 feet and to a vertical depth below surface of 500 feet. Preliminary rough concentration tests have indicated that a concentrate can be made grading 64.0% iron (Assessment report 52P04NE9478).

Mineral Record Details

References

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 Page: 156-157, 161  Date: 1982

Author: Sage R.P., Breaks F.W.

Publisher Name: Ontario Geological Survey

Location:

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Ministry Contact Information

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