Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI53C13SE00066

Record: MDI53C13SE00066

General

Commodities

Primary Commodities: Molybdenum

Secondary Commodities: Gold, Silver

Location

Township or Area: Setting Net Lake Area

Latitude: 52° 49' 8.22"    Longitude: -93° 35' 1.69"

UTM Zone: 15    Easting: 460657.3   Northing: 5852290.27    UTM Datum: NAD83

Resident Geologist District: Red Lake

NTS Grid: 53C13SE

Point Location Description: Precise

Location Method: Data Compilation

Access Description: 200 KM N of Red Lake

Exploration History

1968: discovered by L.D. Ayres during detailed geological mapping for the Ontario Department of Mines. 1969: Minorex Ltd. acquired a portion of the Setting Net Lake stock and conducted geological mapping, trenching, sampling, a ground magnetic survey, and drilled 7 DDH totalling 1945.6 feet. 1970: Minorex conducted airborne magnetic and EM surveys. 1969: Conwest Exploration Company Ltd. optioned some claims over the Setting Net Lake stock and conducted stripping, trenching, mapping, ground magnetic surveys, and drilled 7 DDH totalling 3550 feet. 1977: Vantreal Resources Ltd. conducted ground magnetic surveys. 1978: Vantreal was renamed to Caspian Resources Ltd. and drilled 4 DDH totalling 3092 feet. 1987 and 1989: Noramco Explorations Inc. conducted geological mapping, sampling, and geochemical surveys. 2007: Shoreham Resources Ltd. conducted line cutting, stripping, channel sampling, and drilled 1 DDH totalling 163 m. 2010: Shoreham conducted a helicopter-borne VTEM and aeromagnetic geophysical survey. 2011: Shoreham changed the company name to Guyana Frontier Mining Corp.

Assessment Work on File

Geology

Province: Superior

Subprovince: Sachigo

Terrane: North Caribou

Belt: Favourable Lake

Geological Age: Neoarchean  

Geology Comments

Nov 01, 2007 (Mark Puumala) - The Setting Net Lake prospect is described by Ayres et al. (1982) as an occurrence of widespread molybdenum mineralization of possible porphyry-type in a late-tectonic (2643 Ma), porphyritic granodiorite-quartz monzonite stock that intrudes a supracrustal rock sequence consisting of mafic metavolcanic and metasedimentary rocks. The host intrusion is described by Atkinson et al. (1990) as being medium- to coarse-grained, pale green to grey and massive, with up to 6 mm blue-grey quartz phenocrysts and pink, euhedral potassium feldspar phenocrysts up to 2 cm. A Fine-grained chilled zone is reported by Ayres et al. (1982) to occur on the northern and western margins of the intrusion. Molybdenum mineralization occurs within this chilled zone near the north end of the stock. Ayres et al. (1982) report that molybdenite also occurs locally in the mafic metavolcanic rocks immediately to the north and southwest.

Lithology

Lithology Comments

Apr 28, 2016 (Therese Pettigrew) - The Setting Net Lake stock is described as an oval, epizonal intrusion of porphyritic, biotite granodiorite to quartz monzonite, which intrudes mafic metavolcanic flows and metasediments. A 450 m wide by 2500 m long, east-trending, molybdenite-mineralized zone is situated at the northern end of the stock (Ayres et al., 1982). The granitic host rocks are pale green to grey, massive, medium- to coarse-grained, and contain blue-grey quartz phenocrysts up to 6 mm in size, and pink, euhedral, potassic feldspar phenocrysts up to 2 cm in size (Atkinson et al., 1990).

Mineralization

Mineralization Comments

Jan 12, 2012 (Mark Puumala) - Ayres et al. (1982) reported that the majority of the mineralization consists of closely-spaced (a few cm to 1 m apart) molybdenum-bearing quartz veinlets. The mineralized veinlets are generally less than 2 cm wide and oriented 065-070/75 (Atkinson et al. 1990). Ayres et al. (1982) reported an average veinlet width of 1 to 2 mm, with a maximum width of 15 cm. Atkinson et al. (1990) describe mineralization as consisting of up to 5% disseminated molybdenite with minor pyrite and chalcopyrite. Disseminated sulphides are also reported to occur in numerous approximately 080-striking shear zones that range in width from 0.3 to 0.6 m. The shears post-date the quartz veins, which are reported by Atkinson et al. (1990) to have been displaced along the shear planes. Alteration is reported by Atkinson et al. (1990) to occur in the wall rocks adjacent to mineralized quartz veins. This alteration consists of variable sericitization, albitization, chloritization, epidotization, pyritization, and minor carbonatization. Pale pink alteration halos are also reported around mineralized fractures. Potassium metasomatism was reported by Ayres et al. (1982) in the western portion of the mineralized zone, where muscovite and sericite are reported to be more abundant. Atkinson et al. (1990) also report minor disseminated purple fluorite in wall rocks and quartz veins, and rare pink-brown garnet and green mica in the altered intrusive. In addition, mafic xenoliths are reported to be strongly pyritized. Post molybdenum-mineralization quartz veins are also reported by Ayres et al. to occur within and adjacent to the deposit. These are reported to have diverse orientations, and may contain calcite, minor pyrite and rare chalcopyrite. The deposit is also reported by Ayres et al. (1982) to be cross-cut by a 12 m wide cataclastic zone that corresponds to a late north-northwest-striking fault that post-dates molybdenum mineralization. Within the cataclastic zone, Ayres et al. (1982) report that the molybdenum mineralization has been redistributed. Only small horizontal offsets are reported in the fault zone (vertical displacement is unknown). Late aplite dikes that post-date mineralization are also reported to occur in this fault zone. The mineralized zone is approximately east-trending, and is reported by Ayres et al. (1982) to have an approximate strike-length of 2500 m and width of 450 m. Ayres et al. (1982) reported that molybdemum grades from six drill holes in the eastern portion of the deposit ranged from 0.02 to 0.138% MoS2, while copper grades from surface sampling were reported to be generally less than 0.06%. The Northern Miner (March 23, 1978) reported drill indicated reserves of 100 000 000 tons (90 718 474 t) of ore grading 0.09% MoS2 to a depth of 183 m. Significant gold and silver assays were also reported from surface grab samples collected from a test pit by Atkinson et al. (1990). The samples consisted of sheared, pyritic wall rocks containing minor fluorite, and assay values were up to 4920 ppb (0.14 oz/ton) Au and 1.46 oz/ton Ag. Chute (1988) and Whittaker (1989) also reported anomalous gold assays (501 and 1630 ppb respectively) from grab samples collected from this zone of mineralization. 2007: one DDH completed 163 metres completed, the entire hole averages 0.033 wt% Mo which very similar to the average results from the surface sampling. Using a 0.02 cut takes in the entire hole and gives the above 0.033 wt% Mo average. Composites were therefore calculated using a 0.04 wt % cut to get an idea of the extent of any higher grade portions within the drill hole.

Mineral Record Details

References

Part - Geology of the area between Favourable Lake and Sandy Lake, District of Kenora (Patricia Portion)

Publication Number: ARV38-02.002 Page: 78-81  Date: 1998

Author: Hurst M.E.

Publisher Name: Ontario Dept. of Mines

Location:

MonoMap - Geology of the Trout Lakes area, District of Kenora (Patricia Portion)

Publication Number: R113 Page: 183-184  Date: 1974

Author: Ayres L.D.

Publisher Name: Ontario Division of Mines

Location:

Mono - Geochemical and biogeochemical exploration of molybdenum-copper mineralization at Setting Net Lake, District of Kenora (Patricia Portion)

Publication Number: R156 Page: 4-6  Date: 1976

Author: Wolfe W.J.

Publisher Name: Ontario Division of Mines

Location:

Publication - An Archean Molybdenite Occurrence of Possible Porphyry-type at Setting Net Lake, Northwestern

Publication Number: Vol. 77 No. 5 Date: 1982

Author: Ayres, L.D., Averill, S.A. and Wolfe, W.J.

Publisher Name: Economic Geology, v. 77, p. 1105-1119.

Location:

Article - Red Lake Resident Geologist's District - 1990

Publication Number: MP152.003 Page: 31-66  Date: 1997

Author: Atkinson B.T., Parker J.R., Storey C.C.

Publisher Name: Ontario Geological Survey

Location:

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