In CNX Gas Company LLC V

In CNX Gas Company LLC v. Rasnake, the court held that

A) pursuant to the 1918 deed, the grantors mistakenly believed that all mineral rights, including coal, had previously been conveyed to others and wished to make clear that they were being excluded from the 1918 conveyance to avoid future liability under their general warranty.
B) pursuant to the 1918 deed, the grantors knew that coal alone had been previously conveyed and wished to reserve all other mineral rights to themselves.
C) the 1918 deed conveyed to Unice Nuckles and her successors in interest all of the mineral estate in the land described therein except the coal previously conveyed to others.
D) the 1918 deed was void.