The Devlin showing is situated on the northwest slope of Wilauks Mountain (Mount McGrath) about 6.0 kilometres northeast of Alice Arm. This zinc showing was explored by underground drifts and crosscuts in 1925.

The area is underlain by an assemblage of volcanics and sediments belonging to the Upper Triassic Stuhini Group and the Jurassic Hazelton Group. In the vicinity of Wilauks Mountain, this sequence lies on the western flank of the north-northwest trending Mount McGuire anticline. These rocks have been regionally metamorphosed up to greenschist facies.

The showing is hosted in a sequence of Hazelton Group argillites, quartzites, argillaceous quartzites, volcanic breccias and tuffs, all crosscut by dikes. The showing consists of a quartz vein, averaging 1.07 metres in width, that parallels the bedding of the hostrock. It strikes approximately north, dips 60 degrees east and has been traced for 45 metres. Mineralization occurs over a width of 0.61 metre and consists of bands of sphalerite with minor pyrite. A chip sample taken across the 0.61 metre width assayed 18 per cent zinc (Property File - Report by Gaul, 1925, page 2).