The machine shop is a two-story structure, 416 feet (127 m) long and 54 feet (16 m) wide, made of coursed mine rock with a hipped gable roof covered in corrugated sheet metal.
A clerestory window admits light to the interior, which is floored in concrete.
 The original machine shop was designed around 1882 by Erasmus D. Leavitt Jr., a consulting engineer with Calumet & Hecla; it was used to repair large equipment, including mining skips and trams.
 A major reconstruction was performed in 1907, and additions were made in 1911; it is likely that the building in its current form dates entirely from these two years.
The machine shop is a two-story structure, 416 feet (127 m) long and 54 feet (16 m) wide, made of coursed mine rock with a hipped gable roof covered in corrugated sheet metal. A clerestory window admits light to the interior, which is floored in concrete.  The original machine shop was designed around 1882 by Erasmus D. Leavitt Jr., a consulting engineer with Calumet & Hecla; it was used to repair large equipment, including mining skips and trams.  A major reconstruction was performed in 1907, and additions were made in 1911; it is likely that the building in its current form dates entirely from these two years.
Calumet and Hecla Industrial District