Not all mining properties in and around the Black Hills were American owned. The Harney Peak Tin Mining, Milling, and Manufacturing Company, owner and operator of the great Addie Mine, was an English company developing the cassiterite deposits around Keystone and Hill City. In 1892, a railroad spur ran to the Addie to haul ore to the tin mill just east of Hill City. The operation proved to be unprofitable in the long term and the tracks were taken up in 1917. The few scattered houses which remain are two to three miles east of Hill City on the old Hill City-Keystone gravel road. Submitted by: Henry Chenoweth