The DL (Dore 153) occurrence is located is located on the eastern slopes of Mount Bolduc, approximately 3 kilometres west of Harris Creek.

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 volcanics have undergone varying degrees of alteration, shearing and fracturing. Secondary magnetite and pyrite with minor chalcopyrite and pyrrhotite are commonly found in altered zones. Narrow interbedded bands of limestone have skarn zones developed along their contact with diorite intrusive. These are weakly mineralized with pyrite, magnetite and lesser chalcopyrite. Massive magnetite is found as float.

In 1972 and 1973, New Cosmic Industries completed programs line cutting, soil and silt sampling, geological mapping and a ground magnetometer survey on the DL 1-9 claims. In 1980, Union Miniere Exploration and Mining completed a ground magnetometer survey on the Bolduc claim.