The Duncan Mine, on the road between Atlantic City and South Pass City, WY. This area was known as the Atlantic City-South Pass Gold Mining District and by 1869 nearly 2,000 people were living in the region. By 1871, 12 stamp mills were operating but the decline came quickly and by 1875 the area was almost abandoned.
Active mining occurred in the area off and on from the late 1860s-1930s. But nothing like the big boom in the beginning.
The Duncan Mine had a revival around 1910 when the Beck Mining Company took over and it operated for a few more years. It was also operated intermittently from 1955-1959. In total around $4.1 million was mined from the district.
Restoration work is being done on the mill as well as surrounding buildings.