The Cranberry Lake quarry is underlain by diorite of the Juras- sic to Tertiary Coast Plutonic Complex.
In 1960, 36,128 cubic metres of rock was quarried for construction of the Westview breakwater. In 1965, 6,116 cubic metres of rock was quarried for the foundations of the Powell River pulp mill expansion (Minister of Mines Annual Reports, 1960, page 137; 1965, page 261).