English: Original caption: "The upper works of the Relay Mine No. 3, Centerville, IA. The house in the foreground contains the hoisting engines. The shaft is in the center. The drum-like structure on the right is the fan which ventilates the mine. The trestle running to the left is for carrying away the refuse. The end of the dump pile shows just beyond the trestle. The weighing and storage sheds are beyond the shaft."
location estimated from map file:CentervilleMines.png where this is known to be mine number 31, and refined using the more accurate map at the end of H. Foster Bain, Geology of Appanoose County, Iowa Geological Survey Annual Report, 1895, where it is marked as number 3.
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{{Information |Description={{en|1=Original caption" The upper works of the Relay Mine No. 3, Centerville, IA. The house in the foreground contains the hoisting engines. The shaft is in the center. The drum-like structure on the right is the fan which