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The Black Hills geological setting consists of an elongated dome, about 60 miles wide by 120 miles long, 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 and gold mineralization occurs in both the sedimentary and intrusive rock units, adjacent to minor faults and fracture zones.
Geological Cross Section
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