This is fantastic film from the late 1940s. From 17:10 to 25:00 time are operations through the entire process at the Herculaneum, MO, lead smelter. Also of interest is the method of loading lead concentrate into boxcars (later to be replaced by gondolas). This film also has some of the only footage I have found of the large caverns in some of the Old Lead Belt mines, where one could see mine trains on 3 working levels at once. Missouri Pacific and Missouri-Illinois served many of the Old Lead Belt mines and the smelter at Herculaneum.