Pennsylvania’s oldest working steel mill could soon have a new type of industrial activity on-site: fracking. US Steel has signed a lease with New Mexico-based Merrion Oil and Gas, to develop a Marcellus shale gas well on the grounds of the Edgar Thomson works, originally built in 1875 by Andrew Carnegie.
https://stateimpact.npr.org/pennsylvania/2017/12/27/us-steel-agrees-to-allow-fracking-at-steel-mill/