Hoover mine and coke works
James Hoover opened Hoover coke works and coal mine in 1908. This operation closed in the 1920s, presumably when the Pittsburgh seam coal reserves in Hoover's lease were exhausted. A resident of the Hoover patch told me that the ovens were later operated by Max Nobel and closed down around 1958. (Nobel also operated coke works in Shamrock and Shoaf in the 1950s, 60s, and 70s.)