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1 <br /> 6. Geometric constraint. Because of the difficulty encountered with prominent cleat, the mains <br /> aze not planned to be driven parallel to the lease boundary. This leaves a number of unmined <br />' triangulaz azeas neaz the lease boundary. <br /> 7. Barrier pillars and pillars left in place. Barrier pillars are planned azound room-and-pillaz <br />' panels and longwall sections. They will not be extracted. Furthermore, pillars in the mains, <br /> gate roads and room-and-pillaz panels (after retreat) will not be extracted. <br />' 8 <br />t <br />i <br />hi <br />ll <br />d <br />A <br />d <br />i <br />h <br />Th <br />l <br />f <br />i <br />i <br />032 <br />h <br />l <br />2032 <br /> . <br />reas no <br />w <br />n t <br />w <br />ongwa <br />s an <br />m <br />ne <br />t <br />e year <br />e <br />ast year o <br />operat <br />on <br />s 2 <br />en <br />. <br /> room-and-pillaz panels are completely mined out. Mining could, however, continue with both <br />' the longwalls and continuous miners if additional pazcels of the Prairie Dog Tract is ]eased and <br /> mine planning done for the entire area. <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />38 <br />_~ <br />