North American Tungsten Corporation Ltd.

North American Tungsten Corporation Ltd.

October 04, 2005 11:06 ET

North American Tungsten Announces Initial Mactung Drill Results

VANCOUVER, BRITISH COLUMBIA--(CCNMatthews - Oct. 4, 2005) - North American Tungsten (TSX VENTURE:NTC) is pleased to announce the first assay results from the 2005 summer exploration programme conducted on its wholly owned Mactung tungsten property on the Yukon/NWT border. The 6,000 metre, $1.2 Million programme included a total of 25 surface diamond drill holes, and assays for the first eleven holes have been received and evaluated. The more noteworthy results are tabulated below.


MS142 6340E 271.80 300.60 28.80 0.55 U/G
MS146 6279E 298.65 327.60 28.95 0.73 U/G
MS147 6340E 281.10 313.30 32.20 1.60 U/G
MS148 6340E 293.20 320.70 27.50 1.46 U/G
MS151 6401E 225.80 254.60 28.80 0.97 U/G
MS156 6401E 208.80 244.00 35.20 1.55 U/G

MS143 6279E 112.90 137.00 24.10 0.82 PIT
MS144 6279E 150.30 200.60 50.30 0.52 PIT
MS144 6279E 85.60 129.30 43.70 0.51 PIT
MS145 6340E 81.35 103.30 21.95 0.80 PIT
MS145 6340E 124.40 141.25 16.85 1.00 PIT
MS146 6279E 204.80 222.20 17.40 1.11 PIT
MS147 6340E 91.00 146.50 55.50 0.56 PIT
MS151 6401E 29.90 45.30 15.40 1.31 PIT
MS151 6401E 105.80 124.40 18.60 1.03 PIT
MS156 6401E 37.70 47.50 9.80 1.77 PIT

The mineralization at Mactung occurs in skarnified Lower Cambrian calcareous sediments in thicknesses up to a maximum of just over thirty metres. Grades are generally in the range up to 1.5% WO3 or so; although one intersection obtained in 1972 was close to 3% WO3 (2.87% WO3 over a core length of 30.5m in hole MT72072). The only tungsten mineral is disseminated scheelite, which is associated with massive to semi-massive and disseminated pyrrhotite in the skarnified sediments. The tungsten occurs in five stratigraphic horizons, four of which are shallower, contiguous, and gently dipping to the south, and a fifth, which is about 100 metres deeper. The highest grade and thickest mineralization is associated with the axis of a westerly plunging "Z" fold in the deeper horizon - this fold is not seen in the shallower horizons. A feasibility study by Amax in the early 1980's indicates that the shallower zones can be mined by open pitting methods and the deeper horizon by underground methods.

The 2005 surface diamond drill holes were located to test a westerly plunging "Z" fold in the higher grade underground horizon on strike to the west and down plunge of earlier drilling. The holes were generally collared at about 30 metre intervals along north-south lines 60 metres apart. These drill holes also passed through the four shallower open pit horizons. Drill core was split with a hydraulic core splitter in approximately 1.5m lengths and double bagged for shipment to Global Discovery Laboratories and ALS Chemex Laboratories in Vancouver. Bags were closed with a numbered security tie. The core was assayed for tungsten using fusion with a fluorescence finish. Standard samples, which were prepared by CDN Resource Laboratories of Delta B.C., were included in the sample run, and every twentieth sample will be reassayed by Becquerel Laboratories of Mississauga by neutron activation. These check assay results are not expected for several weeks.

The company notes that this drilling has extended the underground indicated resource 60 metres on strike further to the west, and has upgraded numerous "inferred" resource blocks in both the open pit and underground horizons to the "indicated" category. Mineralized intersections, which were calculated using a 0.5% WO3 cut off grade. Drill hole results have generally been consistent with nearby intersections obtained by Amax in the 1970's and early 1980's. Hole MS156, which was drilled at the same location and dip as old drill hole MT72071, confirmed the width and grade previously intersected (1.66% WO3 over 32.0m in hole MT72071, and 1.60% WO3 over 32.2m in hole MS156). All drill holes were drilled at or close to perpendicular to the mineralization and the intersection widths given above are very close to true thicknesses in nearly all cases. The Company plans to investigate the recovery of small amounts of copper and gold that also occur in the deposit.

The 100 tonne bulk sample of underground ore taken during early September is in transit to a metallurgical test facility.

A new resource estimate will be made for the deposit during the coming winter after all assay results are received. A revised feasibility study will follow after the end of the 2007 summer field season.

This report was prepared under the supervision of David Tenney, C.Eng. the company's qualified person in charge of the Mactung project.


Stephen M. Leahy, Chairman & CEO

WARNING: The Company relies upon litigation protection for "forward-looking" statements.

The TSX Venture Exchange has not reviewed and does not accept responsibility for the adequacy or accuracy of this release.

Contact Information

  • North American Tungsten Corporation Ltd.
    Gregory J. Longphee
    V.P. Corporate Development
    (604) 684-5300
    (604) 684-2992 (FAX)