Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52O03NW00029

Record: MDI52O03NW00029

General

Commodities

Primary Commodities: Uranium, Gold, Thorium

Location

Township or Area: Fry Lake Area

Latitude: 51° 10' 21.99"    Longitude: -91° 25' 28.93"

UTM Zone: 15    Easting: 610124.003   Northing: 5670218.003    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 52O03NW

Point Location Description: GPS reading by OGS, 2006.

Location Method: Data Compilation

Access Description: This occurrence is located 90 km west-southwest of Pickle Lake and 13 km east of the First Nation community of Slate Falls. The trenches and outcrops which expose this occurrence are located on the southwest shore of Don's Lake. Access to this occurrence is by appropriately equipped aircraft to Bamaji lake or to North Bamaji Lake, and then traversing overland to Don's Lake and the occurrence. Don's Lake is marginal for use by float-equipped aircraft. A winter road passes along the Ear Falls to Pickle Lake power corridor about 1 km north of the occurrence.

Exploration History

1954: McCombe Mining and Exploration Ltd. trenched the occurrence and drilled 11 short diamond-drill holes totalling 172 m. 1968: Kirkland Townsite Gold Mines Ltd. did trenching and geological mapping around the occurrence and commissioned an airborne spectrometer survey of the area. 1971: R. Knappett restaked the area of the occurrence and prospected the ground until 1977. 1978: Urangesellschaft Canada Ltd. commissioned a combined airborne VLF-Em, magnetometer and spectrometer survey over the area and did ground work consisting of line cuitting, prospecting, trenching, ground scintillometer surveys, a limited geochemical orientation survey and detailed geological mapping. 1979: Urangesellschaft Canada Ltd. did a radon survey, 2 VLF-Em surveys and a resampling of the Kirkland Townsite and McCombe trenches. 1980: Teck Explorations Ltd. completed further geological mapping and trenching and drilled 2 diamond-drill holes totalling 276 m. 1983: FTM Resources Ltd. commissioned airborne magnetometer and electromagnetic surveys over the occurrence area. 1985-1989: Umex Inc. completed a multi-phased exploration program which included geological mapping and rock and soil geochemistry, ground magnetometer and electromagnetic surveys, 7 diamond-drill holes totalling 1203 m and airborne magnetometer and electromagnetic surveys in the area of the occurrence.

Geology

Province: Superior

Subprovince: Uchi

Terrane: North Caribou

Domain: Uchi

Belt: Meen-Dempster

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (B Nelson) - The No. 1 showing is contained within a relatively narrow east-trending, vertically dipping shear zone, exposed for a distance of 268 m. The host rocks consist predominantly of foliated, occasionally pillowed, fine-grained to medium grained amphibolitized mafic metavolcanics, heavily intruded by lit-par-lit dykes and small bodies of massive to foliated, medium-grained, light grey (fresh surface) biotite, and muscovite-biotite trondhjemite. Adjacent to the shear zone, which reaches a maximum width of about 1.8 m, the wall rocks are locally dominated by a pyrite-bearing muscovite quartzofeldspathic schist which appears to be the sheared altered equivalent of biotite trondhjemite. The latter rock type becomes progressively more schistose, pyritic and muscovitic towards the shear zone. Within the shear zone, a characteristic highly carbonatized fault breccia composed of mafic, chloritic fragments imbedded in a finer grained, more readily disintegrated matrix of carbonate +/- actinolite +/- chlorite +/- biotite occurs intermittently along the exposed length. The carbonate is light brown on fresh surface and is possibly sideritic in composition. The uranium-thorium-gold mineralization occurs in a sequence of rhyolitic pyroclastic rocks, chemical metasediments, and metawacke-mudstones totalling no more than 7.5 m in thickness and exposed along strike for at least 150 m. Although several minor folds were observed in the local metavolcanics and metasediments, the rocks appear to face uniformly southward. The main occurrence is interpreted as being on the southern limb of the Moosetegon Lake Anticline. Consequently, the strata described may be expected to recur around that structure, possibly through the central part of Moosetegon Lake, and the area south of Rockmere Lake.This showing may be contiguous to Kirkland Townsite Showing #2 and Showing #5. Diamond-drilling along the trend of the 3 occurrences supports this hypothesis.

Lithology

Lithology Comments

Dec 07, 2005 (B Nelson) - The oldest units in the mineralized sequence are exposed at the north ends of trenches IX and IV. At trench IX the unit appears to be a rhyolitic to rhyodacitic lapilli-tuff of unknown thickness which has been highly folded. In trench IV the oldest rock is a white weathering rhyodacitic lithic tuff. Because of shearing in this area, this tuff is difficult to distinguish from the trondhjemitic rocks found just to the north, but small lapilli-sized fragments can still be discerned in the pyroclastic rock. In both trenches mentioned, the pyroclastic rocks give low radiometric readings comparable to those obtained in other parts of the region far from the occurrences. Generally, the highest radiation counts corresponding to U and Th mineralization were obtained on actinolite-rich lenses low in pyrite. In trenches II, III and IV, there is a sequence of finely bedded pyritic and graphitic metawacke-mudstone units which reach a maximum exposed thickness of 2 m in trench III. Very thin layers (2 mm thick) rich in fine euhedral pyrite parallel the bedding. The rock is hard and siliceous, but very dark in color. Scintillometer readings in this sequence were far higher than those obtained from any other rock units in the area.

Mineralization

Mineralization Comments

Dec 07, 2005 (B Nelson) - Significant U, Th, Au and Ag values are invariably correlated with bands of highly sheared pyritic sericite schist which intermittently occur along the exposed 240 m strike length of the shear zone. These bands contain up to 30% fine-grained disseminated pyrite and are characterized by both rusty limonitic and light yellow staining. The latter coloration is probably indicative of secondary uranium minerals such as carnotite. The highest geiger counter readings of 950 counts per minute were recorded over these bands. Some of the better assays from this occurrence are: .12 oz/ton Au, 0.44 oz/ton Au over 0.4 feet (in drill core), 1.68 oz/ton Au (trench sample), 0.25 oz/ton Au over 2.0 m (bulk sample from the south zone). NOTE: DDH BAM-88-12, drilled by Umex Inc. in 1988, intersected 0.51 oz/ton Au, 2 oz/ton Ag and 0.74% Zn over 1.1 m at a location between Kirkland Townsite Showings #1 and #2.

Mineral Record Details

References

Map - Cat River-Kawinogans Lake area, District of Kenora (Patricia Portion), Ontario

Publication Number: ARM44F Scale: 1:126,720    Date: 1997

Author: Harding W.D.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Geology of the Cat River-Kawinogans Lake area

Publication Number: ARV44-06.002 Date: 1997

Author: Harding W.D.

Publisher Name: Ontario Dept. of Mines

Location:

Article - 1978 report of Sioux Lookout Resident Geologist

Publication Number: MP084.003 Page: 29  Date: 1997

Author: Palonen P.A., Speed A.A.

Publisher Name: Ontario Geological Survey

Location:

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:

Map - Moosetegon Lake, Kenora District

Publication Number: M2482 Scale: 1:31,680    Date: 1983

Author: Wallace H.

Publisher Name: Ontario Geological Survey

Location:

Thesis - The Bamaji Lake Uranium-Thorium Occurrence

Publication Number: BSc Thesis Date: 1979

Author: Christie, B.

Publisher Name: University of Toronto

Location: Thunder Bay RGP

MonoMap - Geology of the Cat Lake-Pickle Lake area, districts of Kenora and Thunder Bay

Publication Number: R207 Page: 73  Date: 1982

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

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Geology of the Slate Falls area, District of Kenora (Patricia Portion)

Publication Number: R232 Page: 66  Date: 1985

Author: Wallace H.

Publisher Name: Ontario Geological Survey

Location:

Mono - Mineral Deposits of the Central Portion of Uchi Subprovince, Volume 1, Meen Lake to Kesagiminnis Lake Portion

Publication Number: OFR5869 Page: 93  Date: 1993

Author: Seim G.Wm.

Publisher Name: Ontario Geological Survey

Location:

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