The area is underlain by Lower Jurassic Bonanza Group volcanics and Lower Cretaceous Queen Charlotte Group, Longarm Formation sedi- ments.

On the H & W 1 claim there is a silica-rich knoll in dacitic to rhyodacitic tuffs. Silica is the main alteration product with minor kaolinite present as well. In some areas the rocks are pyrite rich. The rocks weather yellow-brown with soft surfaces. No geologic con- tacts have been observed, but the east end of the dacitic rocks is inferred to terminate against a northeast trending fault, the south end is terminated near Holberg Inlet, and the northend is inferred to be near the edge of outcrop exposure. No reference to the west is available.

Based on surface sampling and the inferred boundaries of the dacitic rocks, a reserve of 15,500,000 tonnes grading 91.97 per cent silica (SiO2) has been estimated (Assessment Report 8151).

To the east on the H & W 8 claim, rhyolite was quarried in 1965 by Lafarge Cement of North America Ltd. (refer to 092L 150 - Holberg).

Bog iron, derived from pyrite-rich andesites, is present at the base of the knoll in the southwest (refer to 092L 087 - Quatsino Iron Ore).