The Aplite showing is approximately 200 metres west of the Sax showing (103P 258) near Granby Bay on Observatory Inlet and near the historical mining town of Anyox (Assessment Report 23582).

The region is underlain by a roof pendant, consisting of volcanic and sedimentary rocks, within the Eocene Coast Plutonic Complex. These pendant rocks have been correlated with Middle-Upper Jurassic Hazelton Group rocks and overlying upper Middle to Upper Jurassic Bowser Lake Group sedimentary rocks (Geological Survey of Canada Open File 3453). The Hazelton rocks consist of variably chloritized pillow and massive andesite and basalt with minor mafic tuffs. The overlying Bowser Lake sediments consist of argillite, siltstone and sandstone with minor chert and limestone. There are two observable phases of folding in the area, an initial north-northeast trending phase followed by a later east-northeast trending phase.

The Aplite showing is a sulphide-rich silicified zone, trending along a minor scarp face, with an attitude similar to that of a nearby aplite dike. The hostrocks are massive to pillowed basalt flows of the upper Hazelton Group. The flow banded, Tertiary aplite dike occurs as a prominent outcrop about 200 metres to the east-southeast.

Where minor, late cross-fractures cut this silicified, sulphide-bearing shear, late sulphide-rich quartz veins have developed, having a maximum width of 20 centimetres. Observed sulphides include pyrite, chalcopyrite, sphalerite and pyrrhotite. A grab sample was collected from one of the crosscutting veins. It yielded 3.2 per cent copper, 0.447 gram per tonne gold, 33 grams per tonne silver, 0.09 per cent zinc, 0.0014 per cent lead and 9.5 per cent iron (D.J. Alldrick, B.C. Geological Survey Branch, unpublished data, 1998).