Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000001777

Record: MDI000000001777

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Garden Lake Area

Latitude: 49° 32' 4.61"    Longitude: -89° 47' 55.54"

UTM Zone: 16    Easting: 297504   Northing: 5490653    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 52H12SW

Point Location Description: Trench location from map P3422

Location Method: Data Compilation

Access Description: This occurrence is located adjacent to Garden Lake and can be accessed by boat. Access to the north shore of Garden Lake can be achieved by travelling approximately 7.5 km southwest along Grew Road from the intersection of Highway 811. Then proceed south for approximately 4 km along a secondary logging road.

Exploration History

1946: Prospecting, sampling, geological mapping and diamond drilling by Little Long Lac Gold Mines Ltd. 1987-89: Airborne and ground geophysical surveys, geological mapping and outcrop stripping by Garden Lake Resources. The showing is currently located within the boundaries of the Garden Pakashkan Conservation reserve and is no longer open for staking.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-Geraldton

Geological Age: Archean  

Geology Comments

Oct 21, 2014 (Mark Puumala) - The following geological description is excerpted from Hart (2000). The main rock types in the trenches are basaltic flows and pillowed flows intruded by porphyritic felsic dykes. In some cases the dykes intrude at a shallow angle to the bedding. The basalts are variably sheared, ranging from undeformed pillowed flows on the south to intensely sheared banded chloritic units on the north, in the GLDZ. The intensely sheared units are very strongly iron carbonate altered. The dykes are also highly deformed within the GLDZ, moderately carbonatized, with quartz veining containing minor tourmaline and 1 to 2% pyrite. Quartz veining with tourmaline was not observed elsewhere in the belt. A sample of the quartz veining with tourmaline contained no detectable gold (sample365; Table 3).

Lithology

Mineralization

Mineralization Comments

Oct 21, 2014 (Mark Puumala) - The following discussion of mineralization at the Point Showing is excerpted from Hart (2000 OFR6037). Little Long Lac Mines Gold Ltd. conducted the initial exploration of the gold showing located on the point situated along the south east shore of Garden Lake, west of the Bluff showing (Phelan, 1946). The gold bearing units at the Point showing are described as being quartz filled shear zones in an arkose with coarse cubic pyrite and galena. The best grab sample returned 0.22 oz Au/t, but could not be duplicated by additional sampling or a single diamond drill hole with a length of 194 m. A sample by C. Bumbu in 1984 assayed of 8.5 g Au/t across 3 m in pyritized and cherty buff coloured carbonate rocks (Junnila, 1989). A grab sample during a property visit by Garden Lake Resources returned 23.3 g Au/t. The IP survey identified a string of anomalies located under the lake, north of the Point showing. These results lead to a program of power stripping in 11 areas, geological mapping and collection of 52 samples for assay. The rocks in the trenches were described as a 600 m thick succession of, from north to south, chlorite schist / mafic tuff, sedimentary carbonate-chlorite schist, chlorite schist, and pillowed flows. This succession youngs to the south, with foliations trending south west. Numerous small quartz-carbonate veins parallel to foliation generally contain 1% pyrite. Assays from the sampling program averaged 0.03 g Au/t, and re-sampling of the original trench could not confirm the previously reported gold value. The showing was visited by the Resident Geologist.s staff in 1989, before the stripping was conducted by Garden Lake Resources (Lavigne et al., 1990). The rocks were described as a sheared, buff tan coloured, sericitized feldspar porphyry with relict feldspar crystals and pyrite cubes up to 0.5 cm. A sample of this material assayed 630 ppb Au.

Mineral Record Details

References

MonoMap - Precambrian Geology, Garden Lake Area

Publication Number: OFR6037 Scale:     Date: 2000

Author: Hart T.R.

Publisher Name: Ontario Geological Survey

Location:

Mono - Garden-Obonga Lake Area High Density Lake Sediment and Water Geochemical Survey, Northwestern Ontario

Publication Number: OFR6009 Scale:     Date: 2000

Author: Jackson J.E., Dyer R.D.

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Geology of the Garden Lake area, District of Thunder Bay

Publication Number: R025 Scale:     Date: 1997

Author: Milne V.G.

Publisher Name: Ontario Dept. of Mines

Location:

Data - Ontario Airborne Geophysical Surveys, Magnetic and Electromagnetic Data, Garden-Obonga Area

Publication Number: GDS1105 Scale:     Date: 2000

Author: Ontario Geological Survey

Publisher Name: Ontario Geological Survey

Location:

Map - Precambrian Geology, Garden Lake Greenstone Belt (West Half)

Publication Number: P3422 Scale: 1:20,000    Date: 2000

Author: Hart T.R.

Publisher Name: Ontario Geological Survey

Location:

Map - Garden Lake area, Thunder Bay District

Publication Number: M2058 Scale: 1:63,360    Date: 1997

Author: Milne V.G.

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