The area is located within Paleozoic Stikine Assemblage rocks with complicated structures that are bounded on the west by the intrusive margin of the Coast Plutonic Complex.

The oldest sequence comprises Permian to Lower Triassic lime- stones, siltstones, shales and conglomerates that overlie metamor- phosed sedimentary and volcanic rocks.

The property is underlain predominantly by granodiorite which is in contact mainly with mafic volcanic flows. Minor limestone occurs in the extreme southeast part of the property near the junction of the Craig and Jekill Rivers.

The granodiorite is equigranular, medium-grained and is rela- tively unaltered except for local concentrations of chlorite and occa- sional areas containing iron-rich quartz veins.

The volcanics consist mainly of andesite flows with minor inter- bedded mafic tuffs. These are often highly oxidized with abundant limonite staining.

The carbonates consist of limestone and argillaceous limestone which interfinger with the volcanics in the southeast corner of the property. Kerr (1929) describes a mineral locality in the extreme southeast part of the property which consists of coarsely crystalline galena and chalcopyrite within the limestone. The limestone is in contact with the granodiorite intrusive and is altered into mainly wollastonite and silica.