Sec. 42.2. "Coal bed methane", for purposes of section 317 of this chapter and IC 14-37, means gaseous substances of whatever character lying within or emanating from:
(1) unmined coal seams, either naturally or as a result of stimulation of the coal seam;
(2) the void created by mining out coal seams; or
(3) the gob created by longwall or other extraction methods of coal mining.