Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42D15SW00041

Record: MDI42D15SW00041

General

Commodities

Primary Commodities: Zinc

Secondary Commodities: Copper, Graphite

Location

Township or Area: Tuuri

Latitude: 48° 46' 59.83"    Longitude: -86° 51' 32.21"

UTM Zone: 16    Easting: 510361.68   Northing: 5403374.76    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 42D15SW

Point Location Description: Trench

Location Method: Field Visit

Access Description: The occurrence is located on the north side of Highway 17 about 2 km east of the Steel River bridge at a point approximately 18 km directly east of Terrace Bay in Tuuri Township (claim map G-635). Access may be gained via Highway 17, 18 km east of Terrace Bay.

Exploration History

1951-52: G. Simard - Trenching and unspecified surface work. 1983: Cumberland Resources Ltd. - airborne geophysics, sampling. 1983-84: Eastern Mines Limited - Geophysical survey (VLF-EM, MAG), trenching, sampling, test pitting, DD-11-292.3 m. 1994: B. Fowler, M. Shuman, D. Leishman - prospecting, sampling 1995: Echo Bay Mines Ltd. - prospecting, reconnaissance geological mapping, sampling. 2000: B. Gionet - prospecting, trenching, humus sampling. 2006: Phoenix Matachewan Mines Ltd. - airborne geophysics. 2001-2002: D.M. Michano - prospecting, sampling. 2008-2009: Lund Gold Limited - ground geophysics, soil sampling, prospecting.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Schreiber-Hemlo

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (D McKay) - The geology consists of intercalated metavolcanic rocks and metasedimentary rocks. The metasedimentary rocks consist of graded turbidites with beds up to 25 cm wide. Schnieders (1987) described a sedimentary succession dominated by A- and AB-turbidites, organized into upward (southward) coarsening and thickening, and fining and thinning sequences. These assemblages were thought to represent deposition on suprafan lobes and submarine channels, respectively. The metavolcanic rocks appear to be of intermediate to mafic composition, and possibly amygdaloidal and variolitic. In addition Smyk and Schnieders (1995) have identified spinifex-textured, basltic-komatiite in the Steel River area. A sulphide iron formation is present which parallels the stratigraphy and trends 089 degrees and has a vertical dip. Other rock types include felsic and mafic intrusives, lamprophyre and diabase dikes. Schnieders (1987), Williams (1989) and Smyk and Schnieders (1995) have suggested complex folding events, accompanied by large scale faulting in the Steel River area. This occurrence consists of a pyritic and graphitic slate unit in contact with metasedimentary rocks and altered mafic metavolcanic rocks, which have undergone two folding events. The metasedimentary rocks consist of graded turbidites, including graphitic and pyritic slates, likely representing rain-out mud and exhalative iron. The slate unit contains large colloidal concentrations and nodules of pyrite. Numerous colloform, nodular, spheroidal and framboidal pyrite forms are present, with one apparent type being produced through secondary quartz-rich solutions. A one foot section of up to 80% pyrite was observed in the pyritic shale. The metasediments, clastic sediments and chemical sediments have been intruded and folded by a felsic intrusion. The felsic intrusion contains disseminated pyrite mineralization.

Lithology

Lithology Comments

Jan 20, 2014 (D McKay) - Schnieders (1987) described the Black Fox Lake occurrence as a sulphide-facies iron formation situated between mafic and felsic dike rocks and DE siltstone-slate metasedimentary rocks.

Mineralization

Mineralization Comments

Jan 20, 2014 (D McKay) - Radial pyrite nodules are common at the Black Fox occurrence and display deformation and brecciation textures. The nodules have quartz pressure shadows which form wedge-shaped tails. Remnant nodules have recrystallized pyrite rims; pyrrhotite and magnetite replace the pyrite, with magnetite occurring in the core of the nodules (Schnieders 1987). Numerous colloform, nodular, spheroidal and framboidal pyrite forms are present, with one apparent type being produced through secondary quartz-rich solutions. A one foot section of up to 80% pyrite was observed in the pyritic shale. Grab samples collected from the occurrence in 1984 by OGS Resident Geologist staff returned assay values which varied from 13 to 13 ppb Au, <2 to 2 ppm Ag, 360 ppm Cu and 1110 to 1190 ppm Zn.

Mineral Record Details

References

MonoMap - Geology of the Jackfish-Middleton area, District of Thunder Bay

Publication Number: R050 Date: 1997

Author: Walker J.W.R.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Mineral Occurrences in the Nipigon-Marathon Area, Volumes 1 and 2.

Publication Number: OFR5951 Page: 673-676  Date: 1996

Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.

Publisher Name: Ontario Geological Survey

Location:

Thesis - Geology of Sulphide-Facies Iron Formation in Lower Steel River Area

Publication Number: MSc thesis Date: 1987

Author: Schnieders, B.R.

Publisher Name: Lakehead University

Location: Thunder Bay RGO

Map - Jackfish-Middleton area, Thunder Bay District

Publication Number: M2107 Date: 1967

Author: Walker J.W.R.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Nipigon-Schreiber, geological compilation series, Thunder Bay District

Publication Number: M2232 Scale: 1:253,440    Date: 1973

Author: Carter M.W., McIlwaine W.H., Wisbey P.A.

Publisher Name: Ontario Division of Mines

Location:

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Ministry Contact Information

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