Copper Harbor was host to the first mineral land agency throughout the entire Lake Superior District. Captain Walter Cunningham was appointed by the now-defunct United States Department of War to act as a Special Agent to the area. As soon as wayfinding was established in the Spring of 1843, Cunningham had came to the area and opened his office which was thereafter named the "Government House." It was positioned on Porter's Island, a small rocky island just opposite of present-day Downtown Copper Harbor.