The Dore 99 occurrences are located on a south flowing un-named tributary of Hemmingsen Creek, approximately 1.2 kilometres south west of the summit of Mount Bolduc.

The area is underlain by a series of basaltic flows and related pyroclastics of the Karmutsen Formation and is overlain by, or interbedded with, limestone of the Quatsino Formation; both units belong to the Upper Triassic Vancouver Group. Andesite to rhyolite tuffs and breccias, with minor intercalated greywacke and argillite, of the Lower Jurassic Bonanza Group overlie the Upper Triassic rocks. Intruding this stratigraphic assemblage is the Early to Middle Jurassic Island Plutonic Suite of monzonite to diorite composition.

The occurrence comprises two showings, as shown by a geology sketch map of the area (Property File). The first consists of chalcopyrite in quartz within limestone. Diorite and Karmutsen andesite occur within a few hundred metres to the east.

The second showing, about 500 metres east of the first and near the northwest bank of a creek, consists of magnetite and sulphides in andesite. The creek bed marks the contact with limestone to the southeast.

In 2007 through 2009, Le Baron Prospecting completed a program of prospecting on the area as the Hemmingsen Creek project (claim 535954).