Most of Idaho's ghost towns are mining camps. The first of the territory's gold rushes began at Pierce in 1860, and from 1860 to 1866 Idaho produced about 19 percent of the gold mined in the United States. Idaho City, founded in December 1862 in the Boise Basin, had about 7,000 people by 1864. Silver City followed in the Owyhee Mountains in 1864, and Bayhorse and Custer in the Salmon River country in 1877. In the north, lead and silver finds in 1884 opened the Coeur d'Alene district, the state's richest, where Burke grew up in a narrow canyon above Wallace. A few sites are farm towns instead, such as Chesterfield, settled by Mormon families in 1881 and empty by the end of the 1930s.
The camps cluster in the Boise Basin north of Boise, the Owyhee Mountains to the southwest, the Yankee Fork and Lemhi country in central Idaho, and the Silver Valley in the panhandle. What survives ranges widely. Silver City keeps about 70 standing buildings, Bayhorse and Custer are protected in Land of the Yankee Fork State Park, and Idaho City is still a small town. Many others are a cemetery and mine dumps at the end of a mountain road that is snowed shut for part of the year.