The consensus on the net seems to be a big I don't know concerning using spent ucg coal seams for CCS.
two CCS presentations of interest but not much help in knowing if the CNX coal seam is a suitable site for CCS.
Take a little while to load:
http://www.netl.doe.gov/publications/proceedings/03/carbon-seq/PDFs/104.pdf
http://www.fem-2004.dk/MainMenu/~/media/A277B4EA90284961896031512F3A3898.ashx
