Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52G15NW00018

Record: MDI52G15NW00018

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Copper

Location

Township or Area: Six Mile Lake Area

Latitude: 49° 57' 58.27"    Longitude: -90° 48' 50.83"

UTM Zone: 15    Easting: 656759   Northing: 5537161    UTM Datum: NAD83

Resident Geologist District: Kenora

NTS Grid: 52G15NW

Point Location Description: Map in Assessment report 52G15NW0004

Location Method: Data Compilation

Access Description: Suitably equipped light aircraft can land on Sturgeon Lake during summer and winter. Several boat launching sites off Hwy. 599 between Cobb Bay and Horizontal Bay can be used to reach the lake by boat or snowmobile in season.

Exploration History

1968-1969: Ground magnetic surveys were done by W.G. Wahl Ltd. A follow up survey on lake ice in 1969 extended coverage and confirmed a magnetic anomaly. 1969-1970: 6 holes with a total length of 1583.7 m were drilled. 1970: Selco drilled 2 holes with total length of 443.5 m on the property. 1974: Falconbridge Nickel Mines Ltd. carried out line cutting, magnetometer, horizontal loop EM, and IP surveys, trenching, geological mapping, and drilled 2 holes totalling 185.3 m. 1983: J.W. Redden carried out stripping and mapping. 1985: The Falconbridge (1974) magnetic survey was modified and used to support a correlation between a magnetic low and the main gold-bearing zone. 1986: Abermin Corp collected hand samples, 29 humus samples were sent for analyses. 1987: Abermin Corp. cut a grid over the property and did a VLF-EM and magnetometer survey, a humus geochemical survey, trenching and prospecting on the grid. Older workings were cleaned out and re-sampled. 5 short AW diamond drill holes were completed to obtain samples for assay. Core left on site by Falconbridge (1974) was re-logged and sampled for gold analyses. 1988-1989: Primrose Gold Resources Inc. optioned the property. A grid was cut, magnetic and VLF surveys conducted, and samples taken. In 1989, seven drill holes totalling 592.5 m were sunk at various dips to test selected sections. 1992-1993: Line cutting, geochemical surface sampling, ground EM survey and the re-examination of drill core from earlier drilling by Santana Petroleum Ltd.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Sturgeon Lake

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (R Tuomi) - The following discription of the geology of the Sturgeon Narrows Occurrence is taken from N.F. Trowell's report in GR 154, Geology of the Quest Lake Area. The five diamond-drill holes of 1969 intersected rock units of the Sturgeon Lake Alkalic Complex and a mixed assemblage of intermediate volcanics and metasediments intruded by the complex. Fluorite mineralization, minor strontianite (strontium carbonate) and roscoelite (vanadium mica) were reported to be present. Sulphides and local anomalous gold values were also reported. Mylonite zones intersected by the drilling were interpreted by Wahl as being the result of block faulting which bordered a graben structure extending down Sturgeon Narrows. The two diamond drill holes of 1970 intersected a mixed assemblage of felsic to intermediate pyroclastic rocks, argillaceous metasediments and graphitic tuff with or without pyrite zones. The property is underlain by an assemblage of metasediments and some intermixed pyroclastics which have been intruded by and subsequently fenitized by the Sturgeon Narrows Alkalic Complex. Disseminated fluorite mineralization occurs in the alkalic rocks. As well, local sheared and carbonatized zones contain more massive pods of fluorite.

Lithology

Lithology Comments

Dec 07, 2005 (R Tuomi) - MINERALIZATION OCCURS IN: Carbonatized shear zones. HOST ROCK: altered syenite dike or sill OTHER ASSOCIATED ROCK TYPES: 1) siltstone 2) argillite.

Mineralization

Mineralization Comments

Dec 07, 2005 (R Tuomi) - The sporadic but significant gold assays suggest that other border areas of the alkalic intrusives should be prospected.

Feb 13, 2020 (Therese Pettigrew) - Samples taken in 1986 returned assays of 0.325, 0.97 and 1.033 opt Aun. The Wahl and Falconbridge data indicate that the syenite dyke is intermittently mineralized over a strike length of 320 m. The dyke has a width of 40-70 m. Gold values range from 5 ppb to 5800 ppb with best values coming from Trenches A1, A, and B, and portions of Trench E. Best values were returned from narrow (one to two metre wide) zones which appear to strike approximately parallel to the trend of the syenite dyke. A single zone of high values can be traced for 8.5 m from Trench A1 to Trench B. Gold values in this zone range from 1250 ppb to 5800 ppb. A second zone ranging from 1200 to 4300 ppb gold has been partially outlined on the in-shore portion of Trenches A and B. A 6 m wide zone ranging from 340 to 2400 ppb gold was partially outlined in Trench E from the beach inwards. Gold is concentrated in veins but is erratically distributed. Portions of Trenches E and F contained no visible quartz veins; however, values of up to 800 and 1100 ppb gold were returned from unveined samples. A careful examination of trench samples and core splits did not return any observations of visible gold. Delicate foils and films of visible gold, however, were observed in decomposed pyrite cubes and coating the interior of cavities left by weathered pyrite in samples of syenite gathered from beach rubble. Gold was observed only in those instances where the pyrite had been completed decomposed to limonite. This suggests that gold is present only as a substitute for iron in pyrite lattices. Pyrite is wide spread throughout the syenite dyke as disseminations of fine- to coarse-grained blebs and cubes in quantities averaging 2% to 3%. However, the highest concentration of pyrite and the largest pyrite cubes are found erratically distributed along quartz-ankerite veins, hence the erratic gold values returned from quartz veins (Assessment report 52G15NW0005). Samples taken from the Main Showing returned assays of 6.5, 31.0, and 88.0 ppm Au (Assessment report 52G15NW0004).

Mineral Record Details

References

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

Publication Number: R154 Page: 54-55  Date: 1976

Author: Trowell N.F.

Publisher Name: Ontario Division of Mines

Location:

Article - Kenora District

Publication Number: MP050.001 Page: 25  Date: 1997

Author: King H.L.

Publisher Name: Ontario Division of Mines

Location:

Mono - Uranium and thorium deposits of northern Ontario

Publication Number: MDC025 Page: 126-127  Date: 1984

Author: Robertson J.A., Gould K.L.

Publisher Name: Ontario Geological Survey

Location:

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For detailed information regarding this mineral record please contact the Kenora Resident Geologist District Office