A layer containing the legacy data of permit boundaries of historic underground coal mine permits in Pennsylvania. Data was converted over from the physical "Mylar Review" system for mine permit location information requests. The physical topographic maps and mylar overlays of that system have been scanned, georeferenced, and vectorized to create the permit boundary polygons with an index number attribute. The corresponding index card data has been entered in a spreadsheet. The polygon layers’ attribute tables were joined with the spreadsheet. There are no planned updates for this layer. More recent underground coal mine permit data can be found in the ‘Mining Permits - Bituminous – Underground / Active’ layer. This layer is for informational purposes only and is known not to be a complete listing of all historic permits. • View the data dictionary here: https://gis.dep.pa.gov/datadictionary/District%20Mining%20Operations%20(DMO)/DMO%20Mining%20Permits%20Coal%20Underground%20(Historic).pdf