COMPANY: Northgate Minerals

LOCATION: NW BC

The Kemess North deposit is part of the Kemess Property, which is located approximately 430 km northwest of the city of Prince George, British Columbia, Canada, at 57°02’ north longitude and 126°47’ west latitude. The property includes one active mining lease (#354991), two inactive mining leases (#410732 & #410741) and 206 surrounding and contiguous mineral claims. One additional mining lease is currently in the application process to cover proposed mining infrastructure sites in the Kemess North area. The Kemess North project site is generally located in three north facing alpine cirques with original ground surface ranging from 1,500 to 2,000 m elevation all above tree line. Open pit mining will be located in the centre cirque and eastern cirques. The southern pit wall will be bounded by the southern headwall of the eastern cirques. The crusher and other infrastructure will be located at the pit rim in centre cirque. A natural rock glacier is evident in the western cirque. No surface development has been planned to date in the western cirque.

Gold-copper mineralization forms an inclined tabular zone that is centred on the East Cirque porphyritic monzodiorite. Alteration and mineralization is associated with, and zoned both vertically and laterally from the quartz diorite/quartz monzonite intrusive intersected at depth beneath the East Cirque. The highest-grade Au-Cu zones occur at or near the quartz monzonite – Takla volcanic contact. This zone occurs mostly within the quartz monzonite stock and to a lesser extent within the andesite adjacent to the intrusive stock. The protolith is commonly completely replaced. The quartz monzonite/quartz diorite stock and associated quartz-magnetite zone is interpreted as the heat source driving the porphyry copper-gold system at Kemess North.

Kemess North Ultimate Pit

43-101 Technical Report 2005 Feasibility Report