Mount Rushmore National Memorial #053-02-031 © Russ Finley Photography

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Mount Rushmore National Memorial #72

ID # 053-02-031

of 80

Piece of rock from the monument showing drill marks - Mount Rushmore National Memorial, SD. The stone-removal techniques developed at Stone Mountain, Georgia were used on Rushmore. Borglum had also worked with the Du Pont Company of Delaware in the development of new and exacting techniques for carving stone with dynamite.Photo: Russ Finley Film Size 6X7cm