Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42F05SW00015

Record: MDI42F05SW00015

General

Commodities

Primary Commodities: Sulphur/Pyrite

Secondary Commodities: Copper, Silver

Location

Township or Area: Everest Lake Area

Latitude: 49° 17' 54.99"    Longitude: -85° 50' 20.75"

UTM Zone: 16    Easting: 584401.791   Northing: 5461299.709    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 42F05SW

Point Location Description: Trenches

Location Method: Data Compilation

Access Description: The Little Nama Lake sulphide occurrence is located approximately 20 km north of Manitouwadge and 3.75 km east-northeast of Everest Lake. The occurrence is situated approximately 550 m west of the westernmost tip of Little Nama Lake and 250 m south of a small pond on Little Nama Creek. The occurrence is accessible via motor vehicle followed by travel on foot. From Manitouwadge, travel east and then north along the Camp 70 logging road for approximately 31.5 km to the Jim Lake road. Proceed north along the Jim Lake road for approximately 7.85 km to the Husak road. Proceed west along the Husak road for approximately 13.8 km to the Olson road. Proceed north along the Olson road for approximately 2 km to an unnamed tertiary logging road. Proceed westerly along this road to the vicinity of Little Nama Lake.

Exploration History

1963: Lithogeochemical sampling; Mining Corporation of Canada Limited. 1964: Line cutting and ground geophysical surveys (MAG and HLEM); Kenogamisis Gold Mines Limited. The geophysical surveys identified coincident easterly-trending magnetic and conductive anomalies in the vicinity of the occurrence. One conductor was 3500 feet long and interpreted to contain sulphide mineralization throughout its length. 1965: Geological mapping; M.E. Coates (ODM). 1977: Line cutting, soil geochemical sampling, geological mapping, ground geophysical surveys (RADEM and MAG) and diamond drilling (3 holes totalling 250 m); Noranda Mines Limited (Geco Division). The geophysical surveys indicated that the occurrence is associated with a narrow, easterly-trending, magnetic, conductive anomaly approximately 550 m long. 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 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).

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 Little Nama Lake sulphide occurrence is located within the Quetico Subprovince approximately 2.5 km north of the Quetico-Wawa subprovince boundary (Williams and Breaks 1990). The rocks in the vicinity of the occurrence are moderately to locally strongly foliated (080 degrees/85 degrees S). Mineral assemblages indicate the rocks have experienced upper amphibolite and locally granulite facies-grade regional metamorphism (Williams and Breaks 1990). An east-trending, regional scale, linear topographic feature referred to as the Little Nama Lake lineament (Coates 1968, Map 2141) is located approximately 250 m north of the occurrence. A north-northeast-trending, regional scale, linear topographic feature referred to as the Heron Bay Lineament by Coates (1968) and mapped as a fault by Williams and Breaks (1990) is located approximately 2.5 km west of the occurrence. The occurrence is underlain primarily by an east-trending sequence of migmatitic paragneiss and silicate- and sulphide-facies iron formation (Coates 1968, Map 2141; Williams and Breaks 1990). Intrusion of granitic, tonalitic and pegmatitic material into the paragneiss has resulted in the development of localized lit-par-lit structures (Cooper 1963). Refolded minor folds in the paragneiss indicate multiple episodes of deformation have occurred. Several north-northeast- and northwest-trending diabase dikes occur in the vicinity of the occurrence (Resident Geologist's files, Schreiber-Hemlo District, Thunder Bay). The occurrence is hosted in a 15 m wide silicate- and sulphide-facies iron formation.

Lithology

Mineralization

Mineralization Comments

Dec 07, 2005 (D McKay) - Cooper (1963) described the mineralization as follows: Mineralization consists almost exclusively of pyrite with minor pyrrhotite and magnetite and very minor sphalerite and chalcopyrite. Pyrite occurs as disseminations up to 10% in 'quartz pegmatite' and as narrow massive lenses in, and at the contact of quartz feldspar pegmatite. Pyrite in this latter occurrence is often very coarse-grained. Chip/channel samples collected from the occurrence by Mining Corporation of Canada Limited returned assay values of up to 0.08% Cu, nil Zn, nil Ni, trace Au and 0.26 ounce Ag/ton over 3.5 feet. The geological map prepared by Noranda Mines Limited (Geco Division) indicates the occurrence is hosted in a 15 m wide silicate- and sulphide-facies iron formation that contains locally up to 20% pyrite and pyrrhotite (Resident Geologist's files, Schreiber-Hemlo District, Thunder Bay). Drill hole S-180, collared adjacent to the original showing, intersected 2.9 m of sulphide-bearing iron formation containing 0.07% Cu, 0.05 ounce Ag per ton, and traces of gold and zinc (Resident Geologist's files, Schreiber-Hemlo District, Thunder Bay). Hole S-179, collared approximately 730 m east of the original showing intersected 11.4 m of sulphide-bearing iron formation containing 0.02% Cu, 0.06% Zn, 0.05 ounce Ag per ton and traces of gold (Resident Geologist's files, Schreiber-Hemlo District, Thunder Bay). Other sulphide occurrences, some copper-bearing, are located in the general vicinity of the Little Nama Lake sulphide occurrence. These include the Lovlien and Otter Lake sulphide occurrences located approximately 3.75 and 4.75 km to the east, respectively. These occurrences are hosted in metasedimentary rocks which may represent the eastward extension of the iron formation hosting the Little Nama Lake sulphide occurrence. To date, none of these occurrences have been found to contain economic amounts of gold nor base metals.

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, W.W. Smith Showing

Publication Number: Min Dep Date: 1963

Author: Cooper, G.E.

Publisher Name:

Location: Thunder Bay RGP

MonoMap - Geology of Stevens-Kagiano Lake area, District of Thunder Bay

Publication Number: R068 Date: 1968

Author: Coates M.E.

Publisher Name: Ontario Dept. of Mines

Location:

File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

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