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<br />EXHIBIT 50 <br />Included within this Exhibit are all calculations regarding overburden <br />volumes and coal volumes for the Kerr North Mine Plan. <br />The procedure used was to calculate by geometric area methods the volume <br />of overburden and coal for each pit for pit depths of 300', 240', 180', <br />120' and 60'. Using the values for each, graphs were constructed to aid <br />in determining economic pit depths and the corresponding overburden and <br />coal volumes as well as strip ratios. Included are all rough calcula- <br />tions and rough maps used in making the determinations as well as the <br />graphs developed. <br />• <br />Steady state pit volumes for Pit l13 were calculated based upon the <br />above-described pit volume calculations and varied according to depth. <br />As above, all calculations and graphs regarding steady state pit volumes <br />are included herein. <br />Finally, several comparisons between steady state pit volumes, backfill <br />pit volumes, coal volumes, etc. were made with respect to pit depth. <br />These calculations are included at the end of this Exhibit. <br />The existing overburden stockpile volume and volume of the existing pit <br />have been determined by aerial photographic methods. <br />• <br />