Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42F05SW00010

Record: MDI42F05SW00010

General

Commodities

Primary Commodities: Sulphur/Pyrite

Location

Township or Area: Everest Lake Area

Latitude: 49° 18' 45.59"    Longitude: -85° 58' 10.11"

UTM Zone: 16    Easting: 574901.621   Northing: 5462724.907    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 42F05SW

Point Location Description: Small stripped roadside outcrop

Location Method: Field Visit

Access Description: The Middle Falls Road sulphide occurrence is located approximately 23.25 km north-northwest of Manitouwadge and 1.3 km north-northeast of Halliday Lake. The occurrence is situated on level ground which has been recently clear-cut and scarified by logging operations. The occurrence is accessible via motor vehicle. From Manitouwadge, travel west and then north along the Caramat Industrial Road for approximately 36.75 km to the Middle Falls Road. Proceed west along the Middle Falls Road for approximately 3.5 km to an unnamed tertiary logging road. The occurrence is located in the cut-over area between these two roads, approximately 25 m north of the Middle Falls Road and 15 m east of the unnamed tertiary logging road.

Exploration History

1955: Ground geophysical survey (SP); Dominion Uranium Corporation. 1965: Geological mapping; M.E. Coates (ODM). 1978-1979: Regional lake sediment and water geochemical survey; GSC-MNR. Samples collected from lakes in the vicinity of the occurrence contained slightly anomalous amounts of Au, Cu and Zn. 1989: Geological mapping; H. Williams and F. Breaks (OGS). Dighem airborne geophysical survey (EM, MAG, VLF-EM); Noranda Exploration Company, Limited and Noranda Minerals Inc. (Geco Division). 1991-1992: Reconnaissance till sampling survey; GSC. Samples collected in the vicinity of the occurrence contained slightly anomalous amounts of Cu and Zn. 1992: Prospecting and lithogeochemical sampling; prospectors B. Brinklow and L. Brinklow. The occurrence was discovered during this work. Lithogeochemical sampling; D.B. McKay (OGS).

Assessment Work on File

Geology

Province: Superior

Subprovince: Quetico

Geological Age: Archean  

Metamorphism Type: Regional

Metamorphism Grade: Granulite

Geology Comments

Dec 07, 2005 (D McKay) - The occurrence is located within the Quetico Subprovince and is underlain primarily by locally migmatitic, medium- to coarse-grained, moderately foliated, biotite-quartz-feldspar paragneiss. The gneissosity in the rocks is variable, but tends to strike 256 degrees and dip steeply (80 degrees) to the north. Mineral assemblages suggest the rocks in the area have experienced granulite facies-grade regional metamorphism (Williams and Breaks 1990). The Little Nama Lake Lineament, a regional-scale, easterly-trending topographic feature, is located approximately 2 km south of the occurrence (Coates 1968, Map 2141). Small (1 m long by 0.5 m wide), isolated pods of strongly deformed and metamorphosed mafic metavolcanic (?) amphibolite occur locally within the paragneiss in the vicinity of the occurrence. The occurrence consists of medium- to coarse-grained, disseminated, anhedral grains of pyrite, minor pyrrhotite and trace chalcopyrite (?) hosted in coarse-grained, biotite-quartz-feldspar paragneiss.

Lithology

Lithology Comments

Dec 07, 2005 (D McKay) - The occurrence consists of medium- to coarse-grained, disseminated, anhedral grains of pyrite, minor pyrrhotite and trace chalcopyrite (?) hosted in coarse-grained, biotite-quartz-feldspar paragneiss.

Mineralization

Mineralization Comments

Dec 07, 2005 (D McKay) - The sulphides generally constitute 1 to 3% of the paragneiss and appear to be confined to a foliation-parallel zone approximately 2 m wide which can be traced on surface for approximately 10 m along strike. A rusty gossan has developed on the surface of the occurrence. Grab samples collected from the occurrence in 1992 by D.B. McKay for the OGS returned assay values which varied from nil Au, nil to trace Ag, 0.0265 to 0.0273% Cu, 0.0103 to 0.0122% Zn and <0.001% Pb. Similar sulphide occurrences are widely distributed throughout the metasedimentary rocks in the area (e.g. the Husak Road numbers 1 to 4 sulphide occurrences, the Bunny Lake sulphide occurrence, the Sandy Lake sulphide occurrence, etc.). Most of these sulphide occurrences contain slightly anomalous quantities of base metals and occasionally gold. The economic potential of these occurrences appears to be restricted by their small size and low metal content.

Mineral Record Details

References

Map - Geology of the Manitouwadge-Hornepayne area

Publication Number: OFM0142 Scale: 1:50,000    Date: 1990

Author: Williams H.R., Breaks F.W.

Publisher Name: Ontario Geological Survey

Location:

Mono - Mineral Occurrences in the Manitouwadge Area, Volumes 1, 2 and 3

Publication Number: OFR5906 Date: 1994

Author: McKay D.B.

Publisher Name: Ontario Geological Survey

Location:

File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

Map - Stevens sheet, Thunder Bay District

Publication Number: M2141 Scale: 1:63,360    Date: 1967

Author: Coates M.E.

Publisher Name: Ontario Dept. of Mines

Location:

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