The Mica occurrence is located on the south eastern shore of Fair Harbour.

The region is underlain by west striking, 040 to 060 degree south dipping rhyodacitic to basaltic-andesitic flows, tuffs and pyroclastics of the Lower Jurassic Bonanza Group. The volcanic rocks are intruded by granodiorites and related rocks of the Amai and Zeballos intrusions, located several kilometres to the south and east respectively. The intrusions are related to the Jurassic Island Plutonic Suite.

The occurrence is within an assemblage of chloritic andesite and fine to medium-grained tuff, intruded by a quartz-porphyry dike.

Mineralization occurs in an alteration zone along a fault striking west and consists of quartz and massive sericite with pyrite, magnetite and minor dumortierite.

In the visible exposures north of the base of the slope, the rocks have been highly altered, along the steep fault zone. The visible exposures indicated that the alteration is zoned but not enough can be seen to allow accurate measurements of zone widths. From the unaltered tuff northward, there is an intensely silicified band ranging up to 2 metres wide. Next is a band consisting of a mixture of fine-grained silica, sericite, and magnetite, and finally, an undetermined width of silicified and pyritized material.

Rock from the silicifed zone is pale, creamy white, often brown weathering, hard and fine-grained. A streaky foliation visible in some outcrops probably represents original bedding. In thin sections the rock is seen to consist of recrystallized quartz in grains with diameters of 0.01 to 0.12 millimetre, occasionally reaching 0.20 millimetre. Sericite and pyrite are present in minor quantities.

One channel sample cut along 3.4 metres in a shallow trench across the silica-sericite-magnetite zone contained: SiO2 = 64.52, Al2O3 = 22.11, K2O = 1.21, Na2O=0.22, Fe(total) = 4.50, H2O(+105 degrees C) = 4.20, SO3 = 1.54 (Geology, Exploration and Mining 1971, page 481).

In the early 1970‘s, Canadian Refractories Limited completed programs of geological mapping, geochemical sampling, surface stripping and trenching and three short drill holes. In 1980, the area was explored as the Mica property by J.T. Shearer.