225 ILCS 705/1.03

"Mine" and "coal mine" mean any area of land and any structures, facilities, machinery, tools, equipment, shafts, slopes, tunnels, excavations, and other property, real or personal, placed upon, under or above the surface of such land by any person, used in, or to be used in, or resulting from, the work of extracting in such area bituminous coal, lignite, or anthracite from its natural deposits in the earth by any means or method including the method known as carbon recovery, and the work of preparing the coal so extracted, and includes custom coal preparation facilities.