A loaded coal train and the gravity incline at a coal mine, Pittsburg, Pa., U.S.A.
Miners pushing an "empty" (sides of tunnel show depth of coal vein), coal mine, Pittsburg, Pa., U.S.A.
The presidential party descending the 3,000 ft. shaft into the Congress Gold Mine, Phoenix, Arizona.
View of the R.R. .... Pewabic, Hancock
Hancock and Houghton, Michigan mine railcar.
The Tunnel in the Jackson Iron Mine.
Group portrait of men posed on cars of mine railroad.