Mount Rushmore Black Hills region of South Dakota in order to promote tourism in the region. His initial idea was to sculpt the Needles; however, Gutzon Borglum rejected the Needles because of the poor quality of the granite and strong opposition from American Indian groups. They settled on Mount Rushmore, which also has the advantage of facing southeast for maximum sun exposure. Robinson wanted it to feature American West heroes such as Lewis and Clark, Red Cloud, and Buffalo Bill Cody, but Borglum decided that the sculpture should have broader appeal and chose the four presidents. Senator Peter Norbeck sponsored the project
Mount Rushmore selected Mount Rushmore as the site for several reasons. The rock of the mountain is composed of smooth, fine-grained granite. The durable granite erodes only every 10,000 years, thus was more than sturdy enough to support the sculpture and its long-term exposure. The mountain's height of above sea level made it suitable, and because it faces the southeast, the workers also had the advantage of sunlight for most of the day. The Mount Rushmore area is underlain by well drained alfisol soils of very gravelly loam (Mocmount) to silt loam (Buska) texture, brown to dark grayish brown. Mount Rushmore has