Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52F05SW00008

Record: MDI52F05SW00008

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Dogpaw Lake Area

Latitude: 49° 18' 52.16"    Longitude: -93° 53' 15.1"

UTM Zone: 15    Easting: 435494   Northing: 5462796    UTM Datum: NAD83

Resident Geologist District: Kenora

NTS Grid: 52F05SW

Point Location Description: Precise

Location Method: Conversion from MDI

Access Description: Access to the claims is via Cameron Lake Road (an all-weather, gravel road) that departs east from Highway 71 about 30 km north of the town of Nestor Falls. The Robertson prospect can be access by an approximate 1.5 kilometre long bush trail located on the south side of the Cameron lake road at kilometre 8.5.

Exploration History

2003: Houston Lake Mining Inc. conducted linecutting and magnetometer and VLF-EM geophysical surveys. 2010-11: Houston Lake Mining conducted channel sampling and drilled 16 DDH totalling 1980 m. 2013: Cameron Gold Operations Ltd. drilled 18 DDH totalling 1568.6 m. 2015: Chalice Gold Mines conducted detailed mapping on the historical trench.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Kakagi-Rowan Lakes

Geological Age: Precambrian  

Geology Comments

Apr 28, 2017 (C Ravnaas) - The West Cedartree property is underlain by rocks of the Archean, Savant Lake-Crow Lake metavolcanic-metasedimentary belt in the Wabigoon Subprovince of the Canadian Shield. The property is situated within the Kakagi Greenstone Terrane which is separated from the Rowan greenstone terrane representing a different lithological package to the NW. The Kakagi and Rowan green stone terrains are separated by an offsetting significant regional structural feature the Pipestone-Cameron fault. This northwest striking, steeply northeast dipping fault is a significant zone of deformation and displacement which has been defined for over 100km of strike length and has characteristics similar to the regional “breaks” recognized in other Canadian Archean gold camps. The lithological package to the SW of the Pipestone-Cameron fault has been folded by an ENE plunging structure referred to as the Emm Bay syncline. The folding is conspicuous when examining the airborne magnetic image of the area as it is picked within the stratigraphy of the variably magnetic Kakagi gabbro sills. In total the Kakagi gabbro sills are made up of five sills, lithologically dominated by gabbro with smaller intercalated olivine pyroxenite and peridotite sub-units. The Stephen Lake stock represents the largest felsic intrusive unit in the West Cedartree project area. The stock is trending NNW sub-parallel to the Pipestone-Cameron fault, is lensoidal in shape and the lithological composition is granodiorite. The Stephen Lake stock is situated at the center of the Emm Bay syncline and intrudes into the Kagkagi gabbro sills and Intermediate to felsic volcaniclastic units.

Lithology

Lithology Comments

Aug 25, 2017 (C Ravnaas) - At the Robertson prospect the drill results confirm that the (gold) mineralised zone occurs in a sericite-silica-(Fe) carbonate ± fuchsite alteration package proximal to a gabbro-pyroxenite contact. The highest gold grades coincide with breccia veining which occurs in the aforementioned alteration envelope. The thickness of the gold mineralisation intersections (see Table 3) is encouraging however the gold grade during the 2013 drilling campaign is lower than previous Houston Lake Mining drill results. Diamond drill hole CWR-13-001 features a second style of gold mineralisation which can be attributed to irregular (non-brecciated) quartz-albite-(Fe) carbonate veinlets with sericite-(Fe) carbonate selvages featuring 0.5% of pyrite, cross-cutting weakly altered gabbro (AFRI 2.54711, pg.7).

Aug 25, 2017 (Therese Pettigrew) - The Robertson zone is hosted within a thickened section of Kakagi gabbro sills. The sills are rather heterogeneous with several fine to medium to coarse grain phases, pegamtitic dykes, and ultramafic (pyroxenite) phases. They are also heterogenous with respect to magnetite content. The main zone trends northeast and consist of strong to locally intense ankerite, and in the higher grade areas silica-ankerite–disseminated pyrite replacement of the rock and minor quartz veining. Shearing is often very brittle not strong and often completely overprinted by the silica-ankerite alteration, producing a rather massive-looking rock. The Robertson zone displays a zoned alteration halo with a core ankerite altered zone surrounded by a halo ~50 m wide of weak to moderate calcite alteration. In the halo this alteration is associated with weak to moderate fracturing/brittle shearing of the gabbroic rock. The gabbroic rock outside the zone is essentially unaltered and massive (AFRI 2.56730).

Mineralization

Mineralization Comments

Aug 25, 2017 (C Ravnaas) - Diamond drill hole CWR-13-001 assayed 2.03 g/t Au over an interval of 13.2 m. Diamond drill hole CWR-13-013 assayed 2.57 g/t Au over an interval of 4.15 m. Refer to assessment file 2.54711 for complete list of significant assay results. Grade: best assays - 0.37 opt Au in grab and 0.05 opt Au over 21.9 m (Beard and Garratt, 1984).

Aug 25, 2017 (Therese Pettigrew) - The Robertson zone at exposed surface is a 60 m long by 20 m wide stripped and washed area of gabbroic rock which has three converging shear zones of silicification and variable amounts of disseminated pyrite up to 1-2%. These converging zones trend NNE, NNW, and EW and vary in width from 3-20 m. Channel samples taken in 2010 ran up to 2.97 g/t Au over a length of 0.43 m. Assays from the 2010 drill program returned values of 0.85 g/t Au over 1.5 m, 1.51 g/t Au over 1.3 m, 6.56 g/t Au over 0.6 m, and 8.8 g/t Au over 3.0 m (Houston Lake Mining press release Nov. 16, 2010). Assays from the 2013 drill program range from 1.02 g/t Au over 1 m to 6.24 g/t Au over 0.90 m (AFRI 20000008064). Veining in the Robertson Zone is predominated by more brittle intensely silica-ankerite altered zones and consist of N-S trending, steeply dipping (199°/75°), <1cm wide, quartz-ankerite veins. The veins possess narrow ankerite-disseminated pyrite alteration halos (AFRI 2.56730).

Mineral Record Details

References

Mono - Gold deposits of the Kenora-Fort Frances area, districts of Kenora and Rainy River

Publication Number: MDC016 Page: 35  Date: 1976

Author: Beard R.C., Garratt G.L.

Publisher Name: Ontario Division of Mines

Location:

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