The Dome occurrence is located on the southwest end of Harrison Island in Juskatla Inlet.

The area is underlain by mid-Tertiary Masset Formation rocks consisting of rhyolite tuffs and a unit of porous, chalky-white–weathering, light-grey trachyte. The trachyte, exposed for 100 metres, is silicified and heavily fractured in some areas. The fractures are coated with jarosite, marcasite and fine pyrite. A possible 60-degree fault cuts the volcanics. Fractures and brecciated areas with blue-grey chalcedonic quartz, fine pyrite, marcasite, and traces of free gold are randomly distributed in the trachyte. Rare opal is also reported in a rhyolite host.

In 1978, three samples (Coast 1, 11 and 13) yielded anomalous gold values of 0.28, 0.15 and 0.31 gram per tonne gold (Property File - Mountaineer Mines Ltd. [1980-06-06]: Report on the Charlotte Joint Venture Properties).

In 1916, it was reported in a memoir by Mackenzie that a Mr. Robertson found gold in a ‘bostonitic trachytic’. In 1978, International Prism Resources completed a program of geochemical sampling and geological mapping on the area as the Dome 1-4 claims. In 1980, Mountaineer Mines Ltd. examined the area.