Butte Mineyards, Stewart Mine, Intersection of Main & Woolman Streets, Butte, Silver Bow County, MT

Significance: The Stewart represents one of Butte's oldest and most productive mines. It is historically significant for its association with William A. Clark and the Anaconda Copper Mining Company. The mine's steel headframe has engineering significance because of design and date of construction and the auxiliary hoisting engine constitutes one of the last examples of a steam-powered hoist found on the Butte Mill.
Survey number: HAER MT-36-C
Building/structure dates: ca. 1887 Initial Construction
Building/structure dates: 1891- 1906 Subsequent Work
Building/structure dates: 1910 Subsequent Work
Building/structure dates: 1955 Subsequent Work
Building/structure dates: 1973 Subsequent Work
National Register of Historic Places NRIS Number: 66000438