Quartz diorite of Jurassic age of the Jurassic to Tertiary Coast Plutonic Complex was quarried for jetties, dykes and concrete aggregate on the east bank of the Pitt River, immediately south of the river's confluence with Munro Creek.

The quarry was in production as early as 1900, and was operated to 1959 by Gilley Brothers Ltd. Evans, Coleman & Evans Ltd. took over the operation in 1960 before being acquired by Ocean Cement Ltd. in 1964.

The quarry produces 1.3 to 1.5 million tonnes of crushed aggregate per year (Exploration and Mining 2008 page 81).

In 2009 the pit was estimated to produce 930,000 tonnes (Exploration and Mining 2009 page 67).