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Some golf courses, especially municipal ones, are built on landfills or other unstable, undevelopable land. The Old Works course, in Anaconda, was built on the site of a copper smelter, the Upper Works plant, which processed ore from the mine at Butte, Montana. After a new smelter opened in town, this old one was idled, abandoned, and ultimately became a superfund waste site. In 1994, after years of planning, ground was broken on a Jack Nicklaus-designed course, themed around the old industrial site. The sand in the bunkers is black slag and old machinery is peppered about.