Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52O02NW00006

Record: MDI52O02NW00006


Mineral Record Identification
Record Name(s) Anomaly A - 2000, Duffell Lake #4 - 1995, Napoleon Hole #9 - 1995
Related Record Type Simple
Related Record(s)
Record Status Prospect
Date Created 1995-May-19
Date Last Modified 2022-Sep-27
Created By
Revised By


Primary Commodities: Gold


Township or Area: Duffell Lake Area

Latitude: 51° 13' 11.23"    Longitude: -90° 53' 4.27"

UTM Zone: 15    Easting: 647732.776   Northing: 5676392.952    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 52O02NW

Point Location Description: Diamond-drill #9 collared at grid coordinates 23+75 S, 28+00 W from map in 52O/02NW-0029.

Location Method: Data Compilation

Access Description: The diamond-drill hole collar for hole #9 is located about 55 km southwest of Pickle Lake and about 4.0 km west of Duffell Lake. The occurrence can only be accessed by appropriately equipped aircraft to a near-by lake, and then an overland traverse. There is a small lake about 500 m northeast of the occurrence where it may be suitable for a helicopter to land.

Exploration History

Prior to 1983, Amoco Canada Petroleum Company Ltd. conducted reconnaissance exploration which identified anomalous concentrations of glacially distributed gold in an esker near this occurrence. 1983-84: Amoco Canada Petroleum Company Ltd. conducted 2 reverse circulation (RC) drilliing programs. Till samples from several holes indicated anomalous gold concentrations. Hole F-205 had 3 consecutive samples from the base of a single till unit return assays of 7.0 oz Au/ton 0.087 oz Au/ton and 0.202 oz Au/ton. The 3 samples totalled 3.9 m in length. The second program consisted of 24 tightly spaced RC drill holes to detail the area around hole F-205. Three holes returned till samples assaying over 1000 ppb Au. Amoco then followed up with a fence of 7 diamond-drill holes, which failed to find the source of the gold in the till. 1986: Milner Consolidated Silver Mines Ltd. optioned a group of 44 claims from Amoco Canada Petroleum Company Ltd. which included the area with the anomalous gold in till. !986: St. Joe Canada Inc. commissioned an airborne VLF-EM, HLEM, magnetometer and geological surveys on the optioned claims. Napoleon Petroleum Corporation obtained an interest in the property around this time. 1988: Napoleon Petroleum Corporation conducted a 9 hole diamond-drilling program on the optioned claims testing several geophysical anomalies and extending the fence of holes drilled by Amoco in the 'up-ice' direction. 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

Assessment Work on File
Office File Number Online Assessment File Identifier Online Assessment File Directory
2.20788 52O02NW2006 52O02NW2006
2.23687 52O02NW2007 52O02NW2007


Province: Superior

Subprovince: Uchi

Terrane: North Caribou

Domain: Uchi

Belt: Meen-Dempster

Geological Age: Neoarchean  

Geology Comments

Dec 07, 2005 (B Nelson) - Outcrop in the area around this occurrence is scarce. The area is underlain by the Dempster Lake Gabbro in the west and by the Knupp Lake Stock to the east. The diamond-drilling and the geological mapping completed by the 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. In 1988, Napoleon Exploration Corporation tested 'Conductor N' of their Amoco Project with diamond-drill hole number 9. 'Conductor N' is an electromagnetic anomaly and coincident magnetic anomaly that trends east-southeast for a strike length of 1400 feet. The diamond-drill hole intersected a sequence of 'Tuff-Exhalite chert zones, magnetite iron formation and mafic metavolcanics all of which are intruded by narrow feldspar porphyry dykes'. The description in the diamond-drill log suggests that the 'Tuff-Exhalite' may be an impure, banded, silicate iron formation and mafic metatuff.


Lithology Data
Rock Type Rank Composition Texture Relationship
Mafic Tuff 1 Tuff Near
Feldspar Porphyry 2 Near
Ironstone-unsubdivided 3 Host

Lithology Comments

Dec 07, 2005 (B Nelson) - The 'Tuff-Exhalite' is described as impure, banded, silicate iron formation and mafic metatuff.


Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Alteration Style

Mineralization Comments

Jun 20, 2007 (Mark Puumala) - Three intervals of the 'Tuff-Exhalite' in Napoleon Explorations 1988 diamond drill hole No. 9 returned gold assay values high enough to be considered a gold occurrence (<1000ppb Au). These intervals all contain bands and/or fracture filling of semi-massive pyrite and pyrrhotite. Intervals with only pyrrhotite returned only anomalous assay values for gold. A breakdown of the intervals follows: From 27.12 m to 27.43 m (over 0.31 m) 1332 ppb Au. From 61.87 m to 64.13 m (over 2.26 m) 3287 ppb Au. From 65.17 m to 65.53 m (over 0.36 m) 1559 ppb Au. Since 1988, considerable exploration activity has been carried out in this area by E.W. Bazinet, Milner Consolidated Silver Mines and Iron Lake Minerals. A diamond drilling program carried out in 2000 by Iron Lake Minerals targeted the same geophysical anomaly that was drilled by Napoleon Exploration. A total of eight diamond drill holes (00-1 to 3 and 00-5 to 9) were advanced to test this zone, which is referred to by Bazinet (2000) as Anomaly A, over an approximate strike-length of 900 m. Bazinet (2000) reported the presence of significant gold mineralization (i.e., >0.5 g/t) in seven of these diamond drill holes. The anomalous gold values are associated with bands of sulphidized oxide facies iron formation that occur in a mafic to intermediate metavolcanic-dominated rock sequence. Bazinet (2000) also reports the presence of numerous narrow feldspar porphyry dikes throughout this zone. Notable gold assay results reported by Bazinet (2000) from the Iron Lake Minerals diamond drilling program include the following: 2.924 g/t over 0.65 m in ddh 00-01; 2.955 g/t over 0.55 m in ddh 00-02; 1.458 g/t over 1.61 m in ddh 00-03; 2.288 g/t over 1.52 m in ddh 00-05; 2.128 g/t over 1.16 m in ddh 00-06; 2.387 g/t over 0.77 m in ddh 00-08; and 1.383 g/t over 1.35 m in ddh 00-09.

Alteration Comments

Dec 07, 2005 (B Nelson) - No information known.

Mineral Record Details

1 Lode (Gold)
2 Replacement
Rank Characteristic            
1 Stratabound


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


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


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


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


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


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

Publication Number: OFR5869 Page: 53  Date: 1993

Author: Seim G.Wm.

Publisher Name: Ontario Geological Survey


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