Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52B14SW00002

Record: MDI52B14SW00002


Mineral Record Identification
Record Name(s) Atikokan Iron - 1900
Related Record Type Simple
Related Record(s)
Record Status Developed Prospect With Reported Reserves or Resources
Date Created 1979-Jun-18
Date Last Modified 2022-Mar-18
Created By
Revised By


Primary Commodities: Iron

Secondary Commodities: Copper, Cobalt, Nickel


Township or Area: Hutchinson

Latitude: 48° 47' 3.7"    Longitude: -91° 16' 59.31"

UTM Zone: 15    Easting: 626114.12   Northing: 5404906.23    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 52B14SW

Point Location Description: Abandoned Mine

Location Method: Conversion from MDI

Access Description: Access is available via Highway 11, turn north on to Highway 623 for a distance of approx 5km. Highway 623 joins a gravel road maintained Domtar Woodlands Limited. Travel northeast for approx. 1.5km and turn east onto the mine road just after crossing the Atikokan River. Approx. 1.0km from this turn-off is the old mine site.

Exploration History

1882: the deposit was discovered. 1900: Property was acquired by the Atikokan Iron Company Ltd. and a tunnel was driven 86 m into hill. 1901: 6 D.D. holes. 1907 and 1911: End of tunnel enlarged. 1907, 1909, and 1911: the mine operated, 90,680 tons of ore removed. 1911 - 1912: 4 more tunnels driven, 3 exploratory shafts. 1913: Mining ceased. 1929: Mapping and sampling by J.E. Hawley of the ODM. 1940: M.W. Bartley carried out sampling. 1969: Paulpic Gold Mines Ltd. carried out sampling. 1970: Monteagle Minerals Ltd. examined the property and completed a ground geophysical survey. Kemins Exploration Ltd. carried out an airborne geophysical survey. 1980: M. Lewis acquired the property.


Lithology Data
Rock Type Rank Composition Texture Relationship
Ironstone-unsubdivided 1 Host
Mafic lava flow-unsubdivided 2 Adjacent


Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Alteration Style

Mineralization Comments

Jun 20, 2018 (Therese Pettigrew) - The Atikokan Iron Mine is situated on an iron formation lens (magnetite, pyrite and pyrrhotite with minor chalcopyrite). The unit is approximately 1160 m long and 100 m wide. This deposit is one of a number of similar lenses of the Atikokan Iron Range. These lenticular bodies outcrop intermittently for 26 km along the E-W-trending Quetico fault, which separates rocks of the Sapawe Lake metavolcanic belt to the north from metasediments to the south. The lenses or irregular masses of sulphide occur in a highly-altered gabbro. The gabbro shows variations from feldspathic to hornblendic phases. Away from the contact with the iron formation the gabbro contains practically no sulphide minerals. Locally, the gabbro has been altered to chlorite. The mineralization as exposed in the workings of the Atikokan Iron Mine consists mainly of magnetite with associated pyrite, pyrrhotite and minor chalcopyrite, cobaltite and pentlandite. The mineralization occurs as high-grade lenses which lack continuity both vertically and along strike (Schnieders and Dutka, 1985). Five samples of the pyrite contained an average trace element concentration of 0.19% cobalt, 0.23% copper, 0.13% nickel and 0.03% zinc; five samples of the pyrrhotite contained an average of 0.08% cobalt, 0.30% copper, 0.17% nickel, and 0.02% zinc; and nine samples of the magnetite contained an average of 0.16% cobalt, 0.017% copper, 0.016% nickel and 0.018% zinc (Fenwick, 1979).

Mineral Record Details

Reserves or Resources Data
Zone Year Category Tonnes Reference Comments Commodities
Atikokan Iron Mine 1972 Unclassified 24000000 NM (26/10/1972) 24 Mt @ 35% Fe, 0.40% Cu
Atikokan Iron Mine 1915 Unclassified 10900000 Shklanka R, 1968, MRC 11, Iron Deposits fo Ontario, p299. Atikokan Iron Company (1915) reported 10.9 million tons of low & high sulphur ore.
Atikokan Iron Mine 1913 Unclassified 1700000 Shklanka R, 1968, MRC 11, Iron Deposits fo Ontario, p299. C.M. Wild (1913) reported 1.7 million tons @ 53.7% Fe, 0.133%P, 12.15%SiO2, 3.96% S.
Production Data
Year Tonnes Commodities Reference Comment
1912 82263 Iron 59.8 Percent (%)
Sulphur/Pyrite 2.01 Percent (%)
Shklanka R, 1968, MRC 11, Iron Deposits fo Ontario, p299. 1907-1912: 90,680 t @ 59.8%Fe, 0.11%P, 8.86%SiO2, 2.01%S


Map - Geological series, Sapawe Lake area, east part, Rainy River District

Publication Number: P2388 Scale: 1:15,840    Date: 1981

Author: McIlwaine W.H., Larsen C.R.

Publisher Name: Ontario Geological Survey


Mono - Iron deposits of Ontario

Publication Number: MDC011 Page: 299  Date: 1968

Author: Shklanka R.

Publisher Name: Ontario Dept. of Mines


Part - Geology of the Sapawe Lake area, with notes on some iron and gold deposits of Rainy River District

Publication Number: ARV38-06.001 Page: 42-49  Date: 1998

Author: Hawley J.E.

Publisher Name: Ontario Dept. of Mines


Mono - Property visits and reports of the Atikokan economic geologist, 1979-1983, Atikokan geological survey

Publication Number: OFR5539 Page: 101-103  Date: 1985

Author: Schnieders B.R., Dutka R.J.

Publisher Name: Ontario Geological Survey


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