T3eological Survey Branch Assessment Report Indexing System
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t3eological Survey Branch Assessment Report Indexing System [ARISI IA] ARIS Summary Report Regional Geologist, Smithers Date Approved: 2005.03.23 Off Confidential: 2005.12.01 ASSESSMENT REPORT: 27556 Mining Division(s): Omineca - Property Name: Brenda NAD 27 Latitude: 57 16 00 Longitude: 126 52 00 UTM: 09 6348874 628660 Location: NAD 83 ~atitudei57 15 59 Longitude: 126 52 06 UTM: 09 6349052 628555 NTS: 094E07W BCGS: 094E026 Camp: 051 Toodoggone Camp Claim@): Jan 2, Tom 4 Operator(s): Northgate Minerals Corporation, Canasil Resources Inc. Author@): Edmunds, Frederick Carl Report Year: 2004 No. of Pages: 178 Pages Commodities Searched For: Gold, Copper General DRIL, GEOC Work Categories: Work Done: Drilling DlAD Diamond surface (5 hole(s);NQ HQ) (1445.7 m) No. of maps : 4 ; Scale(s) : 1:2000 Geochemical SAMP Samplinglassaying (686 sample(s);) Elements Analyzed For : Multielement Keywords: Jurassic, Toodoggone Formation, Andesites, Phyllites, Pyrite, Chalcopyrite, Sphalerite Statement Nos.: 3221293 MlNFlLE Nos.: 094E 147,094E 107 Related Reports: 13064,14789,15555,18441,20963,22248,22820,23385,24628,25439,27161 Ministry of Energy and Mines Wednesday, March 23, 2005 Page #: 1 ASSESSMENT REPORT - 2004 EXPLORATION PROGRAM BRENDA PROPERTY: BRENDA DIAMOND DRILL PROGRAM (BRENDA4, BRENDA5, BRENDAG, TOM4, JANZ) OMENICA MINING DIVISION BRITISH COLUMBIA CENTERED ON: LATITUDE: 57' 16' North LONGITUDE: 126' 52' West BCGS 094E026,094E027 - Owned and Operated By- Northgate Minerals Corp. Kemess Mines Ltd. 404-81 5 Hornby Street Vancouver, British Columbia V6Z 2E6 Canada Under Option Agreement With: Canasil Resources Inc. 200-1695 Marine Drive North Vancouver, British Columbia V7P 1V1 Canada November 2004 F.C. Edmunds M.Sc. P.Geo. B.G. Kay B.Sc. GIT Northgate Minerals Corp. 2004 Exploration Program 0 1.0 EXECUTIVE SUMMARY This report details exploration work carried out during the 2004 summer season on the Brenda Property, north-central B.C., by Northgate Minerals Corp. Total expenditures for the season are $246,680. The Brenda Property is subject to an Option and Joint Venture agreement with Canasil Resources Inc. At completion of the 2004 program, Northgate elected not to renew the agreement, and has returned the property to Canasil. The Brenda Property is located in the mountainous area east of the Spatsizi Plateau and west of the Swannell Ranges near Thutade Lake. It is approximately 270kms north of Smithers and 450kms northwest of Prince George and lies in the Omineca Mining Division. The Brenda property is underlain by upper Triassic (Takla Group) andesitelbasaltic volcanics and lower Jurassic (Hazleton Group, Toodoggone Formation) dacitic fragmental volcanics. Stocks, dykes and possible sills of quartz monzonitelquartz diorite composition have intruded the succession and are likely also lower Jurassic in age (ArIAr date in progress). Structurally the deposit area is transected by steeply dipping north to northwest trending normal faults. Porphyry style AuICu mineralization occurs within the Takla volcanic rocks and 0 intermediate intrusive rocks associated with weak to pervasive propyllitic, potassic and locally stronger phyllic alteration assemblages. The goal of the 2004 drill program was to extend strike length and depth on the NW-SE trending mineralization intercepted in the White Pass zone in 2003. The plan required step-outs north and south from BR-03-06 and 07, and stepping back from the interpreted trend to build depth extent. The 2004 Brenda exploration was carried out as a two-phase, 5 hole, diamond drill program totaling 1446 meters drilled between July 7 and September 15'~2004. The 2004 exploration program proved that the White Pass zone can be modeled with some degree of certainty, and that mineralization occurs over a strike length now tested up to 520m, and to depth of 450m. Gold mineralization is reasonably evenly distributed and averages in the 0.5 glt area while copper grades are negligible. 1 Northgate Minerals Corp . 2004 Exploration Program Table of Contents 1.0 EXECUTIVE SUMMARY ................................................................................ 2 2.0 INTRODUCTION ..............................................................................................4 3.0 LOCATION AND ACCESS ..............................................................................4 4.0 CLAIM DATA ....................................................................................................5 5.0 DISTRICT EXPLORATION AND MINING HISTORY .................................. 6 6.0 REGIONAL GEOLOGY .................................................................................... 7 7.0 STRUCTURAL SETTING............................................................................... 8 8.0 PROPERTY GEOLOGY ..................................................................................10 8.1 INTRODUCTION ........................................................................................ 10 8.2 LITHOLOGY ............................................................................................... 10 8.3 STRUCTURE ...............................................................................................12 8.4 ALTERATION AND MINERALIZATION ................................................ 12 9.0 2004 EXPLORATION PROGRAM ................................................................. 12 9.1 HOLE DESCRIPTIONS............................................................................... 14 9.2 METHODOLOGY .......................................................................................18 10.0 CONCLUSIONS AND RECOMMENDATIONS ........................................... 19 11.0 STATEMENT OF COSTS ............................................................................... 19 12.0 STATEMENT OF QUALIFICATIONS ..........................................................20 ,! ,! '; 13.0 REFERENCES .................................................................................................22 L- .( 14.0 LIST OF APPENDICES ................................................................................... 23 List of Figures Figure 1 Brenda Property Location Map (Pautler. 2003) ................................................. 4 Figure 2 Detailed Claim Map with Access roads and MinFile Occurrences. (Pautler. 2003) .........................................................................................................................6 Figure 3 Regional Geology after Massey et.al. 2003 . Minfile Occurrences plotted by color showing principal commodities as follows: gold - red. silver - blue, and copper - green............................................................................................................. 9 Figure 4 Brenda Geology .(Diakow. 2004) ................................................................... 11 Figure 5 2004 (black boxes) and historical (white boxes) Drill Hole Locations. background is Airborne Magnetic Total Field ..........................................................13 List of Tables Table 1. List of Claims....................................................................................................... 5 Table 2 . Brenda Property Work History ............................................................................7 Table 3 . Regional Stratigraphy (Cope 1992) .....................................................................8 Table 4 . 2004 Drill Collar Location and Orientation Data .............................................. 13 Table 5. 2004 Drill Hole Assay Composites - Gold and Copper .................................... 17 Table 6 . 2004 Brenda Summary of Expenditures............................................................ 19 Northgate Minerals Corp. 2004 Exploration Program 2.0 INTRODUCTION This report details exploration work carried out during the 2004 summer season on the Brenda Property, north-central B.C., by Northgate Minerals Corp. The Brenda Property is subject to an Option and Joint Venture agreement with Canasil Resources Inc. Under this agreement, Northgate can earn a 60% interest by staged payments totaling $140,000 and exploration expenditures totaling $2,000,000 over 4 years. At completion of the 2004 program, Northgate elected not to renew the agreement, and has returned the property to Canasil. 3.0 LOCATION AND ACCESS The Brenda Property is located in the mountainous area east of the Spatsizi Plateau and west of the Swannell Ranges near Thutade Lake approximately 270kms north of Smithers and 450kms northwest of Prince George at 57'16' north latitude and 126'52' west longitude. The property, shown in Figure 1, spans the boundary between the 94E and 94D NTS sheets and lies in the Omineca Mining Division. BRITISH COLUMBIA VICTORIA OMKm Figure 1 Brenda Property Location Map (Pautler, 2003) Northgate Minerals Corp. 2004 Exploration Program Access to the project is provided by both air and road. There are regularly scheduled year-round flights from Vancouver, Smithers, and Prince George to 0 Kemess Mine. Road access is available from the town of Mackenzie or Ft. St. James via the Omineca Resource Access road. The area is characterized by broad, open, drift and moraine covered valleys, yielding to sub-alpine plateaus and rugged incised peaks and cirques. Elevations range from 1200m to 1800m, with the tree line occurring at 1500m. The climate is generally moderate, although snow can occur during any month. Temperatures range from -35" to 30'' and average annual precipitation amounts to 890mm. 4.0 CLAIM DATA Table I.List of Claims Tenure#