The area is underlain by granodioritic intrusives which are part of the Cretaceous to Tertiary Coast Plutonic Complex. Locally, a unit of mixed migmatite, aplite dykes, quartz, quartz diorite and quartz- K-spar pegmatite occurs at the contact between quartz diorite and granite-quartz monzonite. Within this unit, are two pure white quartz pegmatite dykes. The smaller one measures at least 100 metres long and about 10 metres wide. The larger exposure is 140 metres by 6.7 metres with an approximate area of 800 square metres. A sample of material assayed 99.50 per cent SiO2 (Assessment Report 9595).