But with the discovery of gold in1874,miners rushed in and destroyed the peaceful life of the Indians,these South Dakota hills became the richest gold-producing area of North America.In 1927,a sculptor,Gutzon Borglum,began to carve the heads of four US presidents on the side of the mountain and completed them in 1941.They are George Washington,Thomas Jefferson, Abraham Lincoln and Theodore Roosevelt. But with the discovery of gold in1874, miners rushed in and destroyed the peaceful life of the Indians, these South Dakota hills became the richest gold-producing area of North America. In 1927, a sculptor, Gutzon Borglum, began to carve the heads of four US presidents on the side of the mountain and completed them in 1941. They are George Washington, Thomas Jefferson, Abraham Lincoln and Theodore Roosevelt