Banks Island is situated near the western margin of the Coast Plutonic Complex. The island is underlain by Tertiary to Cretaceous granitic rocks that vary in composition from gabbro to quartz mon- zonite. The granitic rocks host roof pendants of Permian (?) or older metasediments consisting of crystalline limestone/marble, pelites and skarn.

The Isla Mist property is underlain by granodiorite and quartz monzonite phases of the Coast Plutonic Complex. Locally, the biotite quartz monzonite or granodiorite is fine-grained, light colored and hosts abundant quartz veins infilling a strong fracture pattern. Many light-colored dykes, characterized by muscovite, quartz and white feldspars, cut the fine quartz monzonite unit.

Major fault directions on the property are 295 degrees and 045 to 050 degrees, with extensive fracturing controlling sheeted and stock- work veining.

Three mineralized areas are known to occur on the property and all are hosted by the fine quartz monzonite unit. The unit has associated silica-sericite alteration with stockwork and sheeted veining. Majority of the veins strike between 110 degrees and 140 degrees.

The Tungsten vein consists of scheelite bearing quartz stringers and stockwork mineralization. In 1985 a trench exposed this mineral- ized zone which ranges up to 4.0 metres in width, strikes about 120 degrees and is traceable for approximately 55 metres. Mineralization consists of pyrite and rare blebs of dark brown sphalerite and scheelite. Silicification, sericite, chlorite and pink feldspar alteration occur within the mineralized stringers.

In 1987, a 1.0 metre chip sample collected from the centre of the vein assayed 1.9 grams per tonne silver, 0.083 per cent zinc and 0.039 per cent tungsten (Property File: Christopher, P.A., 1988).