The Albert Head quarry, operated in the 1910's, mined basalt of the Eocene (and Older?) Metchosin Volcanics. The basalt was crushed and used mainly as riprap, and to a lesser extent as roadbed material and as aggregate in the making of concrete.

The quarry is 275 metres long and about 60 metres wide with an average face of 30 metres at 165 degrees. The formation is so severely shattered that regular systems of jointing cannot be determined; the only joints showing any evidence of regularity strike 140 degrees and dip almost vertically.

The basalt is a hard, tough, fine-grained, greenish black rock with numerous fine veinlets of quartz. Disseminated grains of pyrite are common.