The Wharf mine is located seven kilometres west of Lead, South Dakota, in the northern Black Hills region. The region is a heavily forested, small mountain range.
Wharf, South Dakota, US
The Black Hills are set in an elongated dome, approximately 60 by 120 miles, that was uplifted from the surrounding plains approximately 60 million years ago.
The uplift consists of a core of Precambrian metamorphic and igneous rocks surrounded by Paleozoic and Mesozoic sedimentary rocks. Tertiary igneous rocks have intruded both the Precambrian and Paleozoic rocks in the northern part of the Black Hills and, to some extent, are responsible for their present topographic relief. The Wharf mine is situated within the Bald Mountain mining district of the Northern Black Hills, where gold mineralization occurs in both the sedimentary and intrusive rock units, adjacent to minor faults and fracture zones.