Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52O02NW00005

Record: MDI52O02NW00005

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Duffell Lake Area

Latitude: 51° 13' 28.66"    Longitude: -90° 53' 10.43"

UTM Zone: 15    Easting: 647597.781   Northing: 5676927.947    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 52O02NW

Point Location Description: A-vein as marked on E Bazinet prospecting, sampling map in 52O/02NW-0049.

Location Method: Data Compilation

Access Description: This occurrence is located about 56 km southwest of Pickle Lake. It is approximately 4 km west of Duffell Lake and 4 km southeast of Dempster Lake. The occurrence can only be accessed by appropriately equipped aircraft to a nearby lake, and then an overland traverse. There is a small lake about 600 m east-southeast of the occurrence where it may be suitable for a helicopter to land.

Exploration History

1988-2001: Prospecting, trenching, geological and geophysical surveys and diamond drilling by E.W. Bazinet, Milner Consolidated Silver Mines and Iron Lake Minerals.

Assessment Work on File

Geology

Province: Superior

Subprovince: Uchi

Terrane: North Caribou

Domain: Uchi

Belt: Meen-Dempster

Geological Age: Neoarchean  

Lithology

Mineralization

Mineralization Comments

Jun 21, 2007 (Mark Puumala) - The occurrence of gold mineralization at this location was first reported by Bazinet (1991). Seim (1993) describes the geology and mineralization in the area of the occurrence as follows. Outcrop in the area around this occurrence is scarce. Stott and Wilson (1986b) indicate the area to be underlain by the Dempster Lake Gabbro in the west and by the Knupp Lake Stock to the east. The diamond-drilling and geological exploration companies indicate the area to be underlain by mafic-metavolcanic flows with metasedimentary interlayers including iron formation. These rocks are cut by felsic, often quartz and/or feldspar, porphyritic, dykes. The presence of the Knupp Lake Stock in the east was confirmed with the 1988 diamond drilling. This mineral occurrence consists of several gold-bearing quartz veins hosted by mafic-metavolcanic rock. The veins are found in 3 outcrops; 2 outcrops are within 100 m of each other; the other is about 600 m to the northeast. In the outcrop to the northeast, a quartz vein trends east. This vein is up to 25 cm wide, with a strike length of less than 20 m. The vein contains pyrite and arsenopyrite. Grab samples of this vein have reported good gold values. In the two outcrops to the southwest, there are several north-trending veins and a couple of east-trending veins. Some of the veins contain pyrite and arsenopyrite. Grab samples from these veins report good gold values. Grab samples from the vein in the northeast outcrop have reported assay values of up to 0.972 ounce gold per ton. Grab samples from the veins in the southwest outcrops have reported assay values up to 0.237 ounce gold per ton. Bazinet (2000) and Bazinet (2001) report the results of three diamond drill holes (00-10 to 00-12) that were advanced to test this occurrence at depth. Bazinet (2000) describes the gold mineralization as occurring in a quartz vein stockwork system hosted in medium-grained diorite or (more likely) massive basalt-andesite. Numerous significant gold assays were reported from each drill hole, with visible gold noted in ddh 00-12. Diamond drill hole logs indicate the presence of disseminated sulphides, including pyrite, pyrrhotite and arsenopyrite, both in the quartz veins and in the adjacent wall rock. Finely-disseminated magnetite is also reported to be present throughout the metavolcanic host rock. Bazinet (2000) notes that the gold mineralization may be associated with a magnetic anomaly that appears to be traceable over an east-west strike-length of up to 3 km. Notable gold assays reported by Bazinet (2001) include the following: 0.685 g/t over 2.17 m in ddh 00-10; 0.985 g/t over 2.32 m in ddh 00-11; and 0.666 g/t over 2.11 m and 18.138 g/t over 0.15 m in ddh 00-12.

Mineral Record Details

References

Map - Cat River-Kawinogans Lake area, District of Kenora (Patricia Portion), Ontario

Publication Number: ARM44F Scale: 1:126,720    Date: 1997

Author: Harding W.D.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Geology of the Cat River-Kawinogans Lake area

Publication Number: ARV44-06.002 Date: 1997

Author: Harding W.D.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Cat Lake-Pickle Lake, geological compilation series, Kenora and Thunder Bay districts

Publication Number: M2218 Scale: 1:253,440    Date: 1976

Author: Sage R.P., Breaks F.W., Troup W.R.

Publisher Name: Ontario Division of Mines

Location:

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

Publication Number: R207 Date: 1982

Author: Sage R.P., Breaks F.W.

Publisher Name: Ontario Geological Survey

Location:

Map - Precambrian geology, Muskegsagagen-Bancroft lakes area, District of Kenora (Patricia Portion)

Publication Number: M2507 Scale: 1:50,000    Date: 1986

Author: Stott G.M., Wilson A.C.

Publisher Name: Ontario Geological Survey

Location:

Mono - Mineral Deposits of the Central Portion of Uchi Subprovince, Volume 1, Meen Lake to Kesagiminnis Lake Portion

Publication Number: OFR5869 Page: 51  Date: 1993

Author: Seim G.Wm.

Publisher Name: Ontario Geological Survey

Location:

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Ministry Contact Information

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