*** Gold/copper related post (NXG) ***
NORTHGATE ANNOUNCES CONTINUED EXPANSION OF THE LOWER YD AND LOWER BOUNDARY ZONES AT YOUNG-DAVIDSON
Tuesday September 26, 8:00 am ET
VANCOUVER, BRITISH COLUMBIA--(MARKET WIRE)--Sep 26, 2006 -- Northgate Minerals Corporation (TSX:NGX.TO - News)(AMEX:NXG - News) today announced assay results for four additional diamond drill holes at its Young-Davidson property near the town of Matachewan, Ontario.
Exploration Highlights
- Hole 21 in the Lower YD-Zone intersected 23.8 metres averaging 5.44 g/t, 200 metres below all previous intersections in this area. This is the second best intersection in the Lower-YD zone on a grade-thickness basis.
- Hole 17B intersected two broad zones of gold mineralization in the Lower YD zone to the east of hole 17. The upper zone included an interval of 6.4 g/t over 4.9 metres and the lower zone averaged 2.1 g/t over 75.9 metres including an interval of 4.4 g/t over 9.1 metres.
- Hole 16A filled in a large gap above and to the east of hole 16, intersecting 2.7 g/t over a 44.8 metre interval containing a section of 4.64 g/t (uncut) over 16.5 metres.
Ken Stowe, President and Chief Executive Officer, remarked, "The most recent diamond drill results at the Young-Davidson property have substantially expanded the two core zones of mineralization we have discovered between the 5500 and 4000 levels during our 2006 exploration campaign. It is also becoming increasingly evident that the grade of the gold mineralization at the Young-Davidson property is increasing with depth and that the Lower Boundary and Lower YD zones could converge at depth. If both these hypotheses prove to be correct, the economics of the property will improve dramatically from our initial acquisition projections. In the fourth quarter of 2006, our exploration team expects to increase the number of drills active at Young-Davidson to six and more importantly we plan to release an updated NI-43-101 compliant resource estimate for the property before the end of November."
OVERVIEW OF YOUNG-DAVIDSON EXPLORATION AREA
Gold mineralization on the Young-Davidson property is present primarily in an intrusive syenite host rock dipping at approximately 70 degrees to the south. Figure 1, shown below, presents known resource areas (darker shaded areas), potential new resources defined by 2006 drilling (lighter shaded areas),historic mine workings and simplified geology along with the pierce points for the holes drilled so far this year. Elevations in the longitudinal section are based on an artificial mine grid where the surface is defined as 8,000 feet.
To view Figure 1, please click on the following link: http://www.ccnmatthews.com/docs/NGX_Fig1.pdf
2006 DRILLING RESULTS
Collar co-ordinates for the reported drill holes are listed in Appendix 1 and assay results for selected mineralized intervals are reported in Tables 1 and 2.
Lower YD Zone
Hole YD06-17B intersected the Lower YD zone 20 metres below and 60 metres to the east of its parent hole (17). Similar to its parent hole, there are two distinct mineralized intervals (an upper zone UZ and lower zone LZ on the Longitudinal Section Figure 1). Both the upper and lower intervals of hole 17B have substantial true thicknesses of mineralization containing zones of higher-grade mineralization as shown in Table 1. Nearly 40 metres of post-mineral diabase dyke was encountered in the hole between the two mineralized intercepts, cross-cutting a portion of the zone.
Hole YD06-21 intersected the Lower YD zone 200 metres below the previously deepest intersection and returned an average gold assay of 2.75 g/t over an interpreted true thickness of 48.8 metres. This interval contained higher-grade zones of 3.79 g/t over a true thickness of 28.5 metres and 5.44 g/t over a true thickness of 14.6 metres and is the second best hole on a grade-thickness basis ever drilled in the Lower YD zone.
Hole YD06-22 intersected the Lower YD zone at the 5400 level and returned a gold grade of 5.66 g/t over a true thickness of 6.2 metres.
Hole YD06-17A was abandoned due to technical difficulties.
Table 1: Assay Results from Lower YD Zone
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Au
Core Core TRUE Au (Cut to
Hole From To Length Length Thickness Uncut 34.28 g)
ID (ft) (ft) (ft) (m) (m) g/tonne g/tonne
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YD06-17B 3172.2 3321.0 148.8 45.4 38.1 1.64 1.64
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incl 3172.2 3191.5 19.3 5.9 4.9 3.12 3.12
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incl 3305.0 3321.0 16.0 4.9 4.1 6.44 6.44
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3540.0 3789.0 249.0 75.9 65.1 2.11 2.11
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incl 3540.0 3585.0 45.0 13.7 11.8 3.68 3.68
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incl 3540.0 3570.0 30.0 9.1 7.8 4.41 4.41
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incl 3638.6 3650.0 11.4 3.5 3.0 5.68 5.68
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incl 3706.1 3789.0 82.9 25.3 21.9 2.58 2.58
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incl 3735.0 3754.0 19.0 5.8 5.0 3.70 3.70
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YD06-21 4136.7 4398.0 261.3 79.7 48.8 2.75 2.67
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incl 4136.7 4290.0 153.3 46.7 28.5 3.79 3.66
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incl 4180.0 4258.2 78.2 23.8 14.6 5.44 5.19
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incl 4230.0 4245.0 15.0 4.6 2.8 15.52 14.24
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incl 4380.0 4398.0 18.0 5.5 3.4 4.51 4.51
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YD06-22 2728.0 2775 47.0 14.3 11.7 1.3 1.3
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2825.1 2850.0 24.9 7.6 6.2 5.66 5.66
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Lower Boundary Zone
Hole YD06-16A, a wedge deflection from hole YD06-16, tested the mineralized syenite host rock approximately 130 metres above and 60 metres east of the parent hole on the western edge of the Lower Boundary Zone (as it is currently understood) and approximately 45 metres below and 60 metres east from the nearest drill hole YD06-01. The zone at this location has a true thickness in excess of 55 metres grading 2.36 g/t within which there is a higher-grade core with true thickness of 16.4 metres 4.64 g/t as indicated in Table 2.
Table 2: Assay Results from Lower Boundary Zone
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Au
Core Core TRUE Au (Cut to
Hole From To Length Length Thickness Uncut 34.28 g)
ID (ft) (ft) (ft) (m) (m) g/tonne g/tonne
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YD06-16A 4059.3 4255.0 195.7 59.7 59.4 2.36 2.15
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incl 4075.0 4222.0 147.0 44.8 44.6 2.70 2.4
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incl 4102.0 4222.0 120.0 36.6 36.4 3.03 2.85
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incl 4102.0 4181.0 79.0 24.1 24.0 3.81 3.25
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incl 4075.0 4156.0 81.0 24.7 24.4 3.52 2.98
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incl 4102.0 4156 54.0 16.5 16.4 4.64 3.83
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incl 4075.0 4113.0 38.0 11.6 11.5 5.40 4.24
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incl 4102.0 4113.0 11.0 3.35 3.3 15.53 11.52
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Quality Control - Analyses and Sample Location
Details of Quality Control and drill-hole survey methodology are reported in Northgate's April 10, 2006 news release that is filed on SEDAR (www.sedar.com) and may also be accessed on the Northgate website (www.northgateminerals.com).
Qualified Persons
The program design, implementation, Quality Assurance/Quality Control and interpretation of the results is under the control of Northgate Minerals Corporation geological staff that includes a number of individuals who are qualified persons as defined under NI 43-101. Overall supervision of the program is by Carl Edmunds PGeo, Northgate's Manager of Exploration.
Note to US Investors:
The terms "Mineral Reserve", "Proven Mineral Reserve" and "Probable Mineral Reserve" used in this news release are Canadian mining terms as defined in accordance with National Instrument 43-101-Standards of Disclosure for Mineral Projects under the guidelines set out in the Canadian Institute of Mining, Metallurgy and Petroleum (the "CIM") Standards on Mineral Resources and Mineral Reserves Definitions and Guidelines adopted by the CIM Council on August 20, 2000. The terms "Mineral Resource", "Measured Mineral Resource", "Indicated Mineral Resource", and "Inferred Mineral Resource" used in this news release are Canadian mining terms as defined in accordance with National Instrument 43-101-Standards of Disclosure for Mineral Projects under the guidelines set out in the CIM Standards.
About Northgate:
Northgate Minerals Corporation is a gold and copper mining company focused on operations and opportunities in the Americas. The Corporation's principal assets are the 300,000-ounce per year Kemess South mine in north-central British Columbia, the adjacent Kemess North deposit, which contains a Proven and Probable Reserve of 4.1 million ounces of gold and the Young-Davidson property in northern Ontario with a total resource base of 1.5 million ounces of gold. Northgate is listed on the Toronto Stock Exchange under the symbol NGX and on the American Stock Exchange under the symbol NXG.
Appendix 1: 2006 Drill Hole Locations
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Collar Collar
Hole ID Easting Northing Elevation Azimuth Dip Depth
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YD06-01 3500 477 7920 358.7 -70 4083.3
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YD06-01A 3500 477 7920 358.7 -70 3874.7
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YD06-01B 3500 477 7920 358.7 -70 3976.4
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YD06-01C 3500 477 7920 358.7 -70 3897.6
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YD06-01D 3500 477 7920 358.7 -70 3965
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YD06-02 3997 1001 7898 7.7 -74.8 3799.2
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YD06-02A 3997 1001 7898 7.7 -74.8 2204.7
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YD06-03 4112 1843 7928 2.4 -55.9 1587.9
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YD06-04 4112 1841 7929 353.5 -70 1617.4
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YD06-05 3853 1182 7891 358 -80 1102.6
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YD06-06 4302 1870 7937 1.5 -56.2 1614.2
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YD06-07 4179 2404 7959 0 -55 974.4
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YD06-08 3850 1700 7900 355 -55 1446.9
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YD06-09 3839 1187 7895 0 -80 3914
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YD06-10 3850 1700 7900 315 -55 1909.4
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YD06-11 2975 1925 7901 360 -70 2110.3
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YD06-12 2777 2344 7916 0 -72 1282.8
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YD06-13 3500 1200 7874 0 -70 3490.8
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YD06-14 2975 2000 7880 0 -50 1486.2
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YD06-15 2630 1718 7880 0 -70 2181.6
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YD06-16 3023 46 7826 359 -70 5223.8
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(i) YD06-16A 3023 46 7826 359 -70 5098.4
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YD06-17 1777 782 7920 0 -70 4133.9
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YD06-17A 1777 782 7920 0 -70 1830.7
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(i) YD06-17B 1777 782 7920 0 -70 3980.3
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YD06-18 2630 1718 7880 0 -60 1849
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YD06-19 2400 1900 7875 356 -55 1879.9
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YD06-20 3700 200 7880 0 -70 95.1
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YD06-20A 3700 200 7880 0 -70 4893.1
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(i) YD06-21 1350 450 7920 0 -70 4724.4
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(i) YD06-22 1777 1075 7920 0 -70 3454.7
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(i) holes are reported herein, other holes are previously reported
or still in progress.
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