National Geographic : 1945 Aug
-a Staff Photographer B.Anthony Stewart Wyoming's Enormous Open-pit Coal Mines Are Among the Wonders of the Mining World The vein in background, 90 feet thick, lies near Gillette. Coal is loaded by steam shovels and shipped out by trainloads. Underground mines owned bythe Union Pacific are worked about Rock Springs, in southwest Wyoming. Machinery and mining methods developed here havebeen adapted toGreat Britain's deep coal mines.