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• enough to economically mine. If the thickness were increased additional <br />partings would be picked up which would in turn, greatly increase t-he <br />ash content of the mine run coal. Using this as basic criteria, there <br />are 1219.71 mineable acres resulting in 13,951,360 tons. <br />Due to certain factors, i.e., OSD1, subsidence, State of Colorado, <br />etc.; no detailed mine plan has been drawn up at this time. Recoverable <br />reserves were therefore calculated by first deducting coal contained in <br />a 50 foot boundary strip (31,889 tons) and then using a recovery factor <br />of 50% for the remaining acreage. This results in a total of 6,959,736 <br />tons. If, once mining commences, it appears that additional coal can be <br />recovered from the west and southwest portions of the lease, every <br />efffort economically feasible will be made to do so. It is anticipated <br />that both room and pillar methods and longwall techniques will be utilized <br />. depending upon conditions for the extraction of this coal. <br />Additional information pertaining to this lease can be found in the <br />drill hole data accompanying this report. <br />Lease C-024998 <br />Mineable Reserve Base <br />(Carbonera) <br />Avg. Btu/Pound <br />Category Acres Avg. Thickness Tons (As Received) <br />lieasured 428.46 6.26' 4,831,381 10,426 <br />Indicated 791.25 6.40' 9,119,979 10,426 <br />Inferred -- - - -- <br />Recoverable Reserves <br />(50X Recovery Rate) <br />Category Acre< AvG. Thickness Tons <br />?fuasured 428.46 6.26' 2,413,944 <br />Indicated 789.20 6.40' 4,545.792 <br />Inferred -- -- __ <br />• <br />