Finding new mines within old mines at Leadville, Colorado.

Discusses mining in Leadville, Colorado. Zinc mining; Discovery of placer gold in the 1860s; G.F. Loughlin, of the United States Geological Survey; Zinc deposits in the US; The Hayden Survey in Colorado; The Empire Zinc Company; The Hilltop Mine; The Meadville Mining Company; The erection of roasting furnaces at Leadville in 1883; Walter Renton Ingalls, a noted authority on lead and zinc; Carbonate ores; More.