Group of 10 stereoviews depicting mining and heavy industrial operations in the United States. The views include interior scenes of mining tunnels where workers operate drills and extraction equipment as well as underground chambers illuminated by early electric lighting systems.

Additional stereographs show processing machinery and ore-handling equipment within industrial plants. One view illustrates conveyor and milling machinery used in ore processing, while others depict miners working deep within narrow shafts supported by timber bracing.

Published by stereographic firms including the Keystone View Company and Underwood & Underwood, these photographs were issued as part of educational series documenting the industrial development of mining regions during the late nineteenth and early twentieth centuries.