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