Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000002057

Record: MDI000000002057

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Burchell Lake Area

Latitude: 48° 35' 46.9"    Longitude: -90° 33' 14.45"

UTM Zone: 15    Easting: 680340   Northing: 5385474.99    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 52B13SE

Point Location Description: UTM, Google Earth

Location Method: Based on Assessment

Access Description: Access to the Coldstream Property is by Secondary Highway 802, which leads south from Highway 11, two kilometres west of the village of Kashabowie. The Trans Canada Highway passes just 2.5 kilometres north of the Property, and logging roads provide easy access throughout the claim area. The Goldie Zone, is accessed from a logging road that branches south from Highway 802.

Exploration History

1952-55: Coldstream Copper Mines Ltd. conducted a magnetic survey, mapping and drilled 1 DDH. 1989: Noranda identified surface gold occurrences north of Goldie Lake while working in the East Coldstream area. Minor trenching completed. 2005: Alto Ventures included the Goldie Zone in an IP survey. 2007: Alto relocated and sampled the Noranda trenches. 2009: Foundation Resources enlarged upon the Noranda work completing 9 trenches along a 300-metre strike length taking 141 channel samples. 2011: Foundation Resources carried out a structural study.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Shebandowan

Geological Age: Archean  

Lithology

Lithology Comments

Oct 09, 2018 (Therese Pettigrew) - The Goldie Lake area is predominantly underlain by mafic metavolcanics (aphyric to amygdaloidal flows), which are intercalated with minor, narrow lenses of felsic and intermediate volcanic rocks. Strong foliation and outcrop scale shearing have generally deformed these rocks into chlorite and sericite schists according to their respective mafic and felsic volcanic protoliths. A southwest striking and steeply northwest dipping structure, the Goldie Lake deformation zone, is interpreted to extend northeast from south of the North Coldstream Mine for 6.5 km to the northeast of Upper Shebandowan Lake. Northeast of Goldie Lake, the deformation zone splits into two: a west-striking branch heads towards the North Coldstream Mine, and a southwestern branch to the Skimpole Lake area. Quartz and quartz-feldspar porphyry dykes and sills lie along the Goldie Lake deformation zone in a similar fashion as to those observed in the OG Deposit, located approximately 850 metres north of Goldie Lake. All rock types in the Goldie Lake area are variably altered (silica, chlorite, carbonate and hematite) and often mineralized with trace to up to 20% pyrite+/-chalcopyrite (AFRI 20000013648).

Mineralization

Mineralization Comments

Oct 09, 2018 (Therese Pettigrew) - The Goldie Zone is comprised of a massive mafic sill-like body intruded by several feldspar porphyry dykes and quartz-feldspar porphyry dykes trending roughly parallel to the trend of the mafic sill. The sill is notable for the widespread presence of pyrite (plus pyrrhotite) as disseminations and locally along fine fracture planes and for the presence of broad zones of a magnetic response several metres wide. The source of this strong magnetic response is thought to be disseminated magnetite in the sill. Most sulphides, especially in the shear zones, appear to be pyrite but some pyrrhotite was detected, notably in the more massive parts of the sill. The shear zones within the sill show a proportionately greater presence of pyrite as stringers along shear foliations and cleavages. It appears that most of the sulphide mineralization is localized along relatively narrow shear zones within the mafic sill and typically close to one or more feldspar porphyry dykes, which acted as a structural facilitator for localizing the shearing within the mafic sill close to the steeply dipping margins of the dyke. In such cases, the shear zone often is not restricted to the mafic sill but straddles the adjacent porphyry dyke, typically on one side of the dyke. Only in trenches 8 and 9 does it become more apparent that shearing within the mafic sill becomes broader and less dependent on the presence of a porphyry sill. Channel sampling by Foundation Resources Inc. in 2009 demonstrated a mineralized strike length of at least 300 metres, with results including 30.7 g/t Au over 1.15 metres. Some of the most significant gold assays obtained from 2009 channel sampling include: 1.21 g/t Au over 3.49 metres, 1.95 g/t Au over 1.30 metres, and 2.57 g/t Au over 3.49 metres (AFRI 20000013648).

Mineral Record Details

References

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

Publication Number: R019 Scale:     Date: 1997

Author: Giblin P.E.

Publisher Name: Ontario Dept. of Mines

Map - Precambrian Geology, Burchell-Greenwater Lakes Area, West Half

Publication Number: M2622 Scale: 1:20,000    Date: 1997

Author: Osmani I.A.

Publisher Name: Ontario Geological Survey

Thesis - Report on North Coldstream Mines Limited

Publication Number: B.Sc Scale:     Date: 1963

Author: Scott, S.D.

Publisher Name: University of Western Ontario

MonoMap - Geology and Mineral Potential, Greenwater Lake Area, West-Central Shebandowan Greenstone Belt

Publication Number: R296 Scale:     Date: 1997

Author: Osmani I.A.

Publisher Name: Ontario Geological Survey

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