Almost certainly not.

> Owning mineral rights doesn't create liability for existing mines.

I was under the impression that it generally does. However, the documents are generally old paper records (often missing) and fragmented between multiple polities in Pennsylvania. The owners of the mineral rights obviously know who they are but reconstructing the trail from public records is quite time consuming and provides a lot of "plausible deniability".

But, boy, once fracking made those mineral rights worth something, the owners sure showed up and found those "missing" records in a real hurry.