Northgate Minerals Corporation
AMEX : NXG
TSX : NGX

Northgate Minerals Corporation

May 25, 2006 19:26 ET

NORTHGATE INTERSECTS 8.92 g/tonne GOLD OVER 218.5 FEET AT YOUNG-DAVIDSON

VANCOUVER, BRITISH COLUMBIA--(CCNMatthews - May 25, 2006) - Northgate Minerals Corporation (TSX:NGX)(AMEX:NXG) today announced that diamond drilling at its Young-Davidson property near the town of Matachewan, Ontario continues to intersect significant gold mineralization. Assay results from six additional drill holes are reported herein.

Drilling Highlights

- Hole YD06-1B, returned three gold bearing intervals, 33.49 g/tonne over 32.5 ft and 16.45 g/tonne over 20 ft both within a larger zone grading 8.92 g/tonne Au over 218.5 ft. Drill hole YD06-01B is the second best hole ever drilled on the property by any operator.

- Hole YD06-09, the second deepest hole ever on the property, intersected an extension of the Lower Boundary Zone 300 feet east and 250 ft below YD06-01B and returned 8.28 g/tonne Au over 52 ft within a broader zone of 4.49 g/tonne over 102.7 feet.

- Confirmation hole YD06-06, drilled to test the Upper Boundary Zone in the vicinity of historical intersections, returned 3.47 g/tonne over 105 ft and 5.33 g/tonne over 46.5 ft both within a zone grading 2.63 g/tonne over 199 ft. These results are consistent with the historic results.

- Four drills are presently active on the property. Two drills are testing the Lower Boundary Zone, one drill has just started the first hole testing the Lower YD Zone and a smaller fourth drill is testing the Lucky Zone.

Ken Stowe, President and Chief Executive Officer, stated, "Our view at the time that we acquired the Young-Davidson property was that it was a mine waiting to be developed and our exploration results thus far have provided compelling evidence to support this view. The wide gold intercepts in the deeper holes we have drilled below the Lower Boundary Zone are particularly noteworthy because they should make for a significant increase in the overall resource in a zone that has an ideal configuration for low cost bulk mining. We are also seeing considerable fine grained visible gold and some short, high-grade assay intervals that indicate the possibility of "jewellery box" zones once we get to detailed evaluation."

Overview of Young-Davidson Exploration Area and 2006 Exploration Program

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, is a vertical, north looking, longitudinal section on which known resource areas (darker shaded areas with dotted boundaries), historic mine workings and simplified geology are presented along with the pierce points for the holes drilled so far this year.

The 2006 exploration campaign is designed to delineate additional gold resources in the prospective exploration zone (lighter region surrounding and below the known zones of inferred resources) and to increase the overall geologic confidence of these resources, resulting in a new property resource statement at the end of 2006. This will be accomplished by drilling 2,000 to 5,000 foot diamond drill holes from surface which will intersect the syenite host rock at depths of 1,000 to 4,000 feet.

To view Figure 1 please click on the following link: http://www.ccnmatthews.com/docs/ngxfigure.pdf

2006 Drilling Results

Collar co-ordinates for the 2006 drill holes are listed in Table 2.

Hole YD06-1B (a wedge deflection from hole YD06-1) is located 175 feet east and 120 feet above YD06-01A. Historic hole, YD9530x (4.42 g/tonne over 80 feet) is located 130 ft to the east, and 30 ft above YD06-01B. Drill hole YD06-09 is located a further 200 ft to the east and 300 ft below YD95530x. Hole YD06-09 intersected 102.7 feet of 4.49 g/tonne within which there is 52 feet of 8.28 g/tonne. Collectively these results and those from drill holes YD06-01 and 01A (reported on April 10, 2006) confirm the Lower Boundary Zone's potential as an attractive bulk mining target.

YD06-05 (not shown on the longitudinal cross section) was abandoned due to excessive deviation in the hole before reaching its target. The intended target for hole YD06-05 was tested by hole YD06-09.

Drill hole YD06-06 was drilled in the Upper Boundary Zone to confirm several historical intercepts all of which are within 120 ft of YD06-06.

Drill holes YD06-04 and YD06-08 did not return significant results from the Upper Boundary Zone as they both intersected post mineral Matachewan diabase dykes at target projection.

YD06-07 was designed to test an apparent gap in mineralization between the 6300 and 6500 elevation in the vicinity of section 4200E. Assays returned 1.35 g/tonne over 106 ft with a narrower zone of 14.76 g/tonne over 6 ft.

Drill hole YD06-10 was not targeted at a specific mineralized zone but was drilled at an oblique angle to the geological units of interest in order to gain information about the orientation and thickness of some of the post mineral diabase dykes. The hole returned 3.37 g/tonne Au over 69.6 feet in a zone between the Upper Boundary Zone and the Lucky Zone. Within this section a 31 ft zone returned 6.69 g/tonne. The nearest historical drill hole M03-50 (4.38 g/tonne over 10.6 feet) is located 150 feet east and 200 feet above YD06-10.

YD06-11 was drilled on the east flank of the Lucky Zone and returned 3.01 g/tonne over 45.5 feet within a thicker section of 97 ft which averaged 2.23 g/tonne. YD90-31, an historic hole located on the same section as YD06-11 but 200 ft below, assayed 72.7 ft of 2.15 g/tonne. Assay results from drill holes YD06-12, 14 and 15 are pending from the Lucky zone area.

Table 1 below summarizes these intersection including preliminary true thicknesses, cut and uncut grades.



Table 1: Assay Results from 2006 Diamond Drill Holes

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Au Au
(Cut (Cut
to to
TRUE Au 34.28 Au 34.28
Core Core Thick- Un- g) Un- g)
Len- Len- ness cut (2) cut (2)
Hole From To gth gth (1) g/ g/ Oz/ Oz/
ID (ft) (ft) (ft) (m) (m) tonne tonne ton ton
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YD06-01B 3487.5 3706.0 218.5 66.6 56.5 8.92 4.79 0.26 0.14
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incl 3487.5 3520.00 32.5 9.9 8.4 33.49 8.87 0.98 0.26
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3585.0 3605.0 20.0 6.1 5.2 16.45 11.35 0.48 0.33
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YD06-06 1032 1231.0 199.0 60.7 54.4 2.63 2.63 0.08 0.08
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incl 1032.0 1137.0 105.0 32.0 28.7 3.47 3.47 0.10 0.10
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1041.5 1088.0 46.5 14.2 12.7 5.05 5.05 0.15 0.15
--------------------------------------------------------------------

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YD06-07 563.5 669.5 106.0 32.3 32.3 1.35 1.35 0.04 0.04
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incl 663.5 669.5 6.0 1.8 1.6 14.76 14.76 0.43 0.43
--------------------------------------------------------------------

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YD06-09 3359 3461.7 102.7 31.3 19.7 4.49 3.97 0.13 0.12
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3409.7 3461.7 52.0 15.8 11.7 8.28 7.24 0.24 0.21
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YD06-10 1602.40 1672.0 69.6 21.2 9.3 3.37 3.37 0.10 0.10
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1641.00 1672.0 31.0 9.4 4.2 6.69 6.69 0.20 0.20
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YD06-11 1445 1542.5 97.5 29.7 22.5 2.23 2.23 0.07 0.07
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1497 1542.5 45.5 13.9 10.6 3.01 3.01 0.09 0.09
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1497 1522.0 25.0 7.6 5.8 3.69 3.69 0.11 0.11
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In order to put the Northgate drill results into the context of past production and exploration, Graph 1 shows a plot of gold grade on the Y axis and length of intersection on the X axis. Also plotted is the 100 gram metre curve that is a commonly used screening tool within the exploration industry. These selected historic reported intersections(3) are within the same rock type, with similar alteration and mineralization, as the 2006 drilling results being reported. The graph clearly shows that the 2006 results are among the best holes on the property. Collectively the Young-Davidson results, historic and current, also compare very favorably with many other projects in the gold industry.

(1) As measured from interpretation of geological cross sections.

(2) This cutting factor has been determined by an Independent Qualified Person in the 2004 NI 43-101 report as outlined in Northgate's April 10, 2006 news release. Assays in hole YD-06-1B that required cutting include 301 g/tonne over 3 ft and 72 g/tonne over 2.7 feet. In hole YD-06-09 there is a 3.6 ft sample of 49.3 g/tonne.

(3) As this data is historic in nature, the Company has no assurance that the Quality Assurance and Quality Control in the analytical laboratory would meet today's standard, however, the Company believes that the work was done to the acceptable technical standard of the time.

To view Graph 1 please click on the following link: http://www.ccnmatthews.com/docs/ngxgraph.pdf

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.

Forward-Looking Statements

This news release includes certain "forward-looking statements" within the meaning of section 21E of the United States Securities Exchange Act of 1934, as amended. These forward-looking statements include estimates, forecasts, and statements as to management's expectations with respect to, among other things, future metal production and production costs, potential mineralization and reserves, exploration results, progress in the development of mineral properties, demand and market outlook for commodities and future plans and objectives of Northgate Minerals Corporation (Northgate). Forward-looking statements generally can be identified by the use of forward-looking terminology such as "may", "will", "expect", "intend", "estimate", "anticipate", "believe", or "continue" or the negative thereof or variations thereon or similar terminology. Forward-looking statements are necessarily based upon a number of estimates and assumptions that, while considered reasonable by management are inherently subject to significant business, economic and competitive uncertainties and contingencies. There can be no assurance that such statements will prove to be accurate and actual results and future events could differ materially from those anticipated in such statements. Important factors that could cause actual results to differ materially from Northgate's expectations are disclosed under the heading "Risk and Uncertainties" in Northgate's 2005 Annual Report and under the heading "Risk Factors" in Northgate's 2005 Annual Information Form (AIF) both of which are filed with Canadian regulators on SEDAR (www.sedar.com) and with the United States Securities and Exchange Commission (www.sec.gov). Northgate expressly disclaims any intention or obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise.



Table 2: 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 4000
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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 5000
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YD06-17 1777 782 7920 0 -70 4000
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YD06-18 2630 1718 7880 0 -60 2000
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Contact Information

  • Northgate Minerals Corporation
    Mr. Ken G. Stowe
    President and Chief Executive Officer
    (416) 216-2772
    or
    Northgate Minerals Corporation
    Mr. Jon A. Douglas
    Senior Vice President and Chief Financial Officer
    (416) 216-2774
    www.northgateminerals.com