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<br />t <br /> <br /> <br /> <br />1 <br />the northern portion of the area could limit productivity. <br />More costly access and coal handling, as a result of old <br />workings, make the remaining seams and portions of the pro- <br />perty somewhat less desirable. <br />Estimated remaining coal reserves were determined by <br />planimetering the area between old individual seam workings <br />and the 1500' coverline and the 1500-3000' coverlines for <br />1 various portions of the property. In-place, remaining re- <br /> serves were the product of apparent thickness, planimetered <br />' acreage and 1800 tons(acre foot. The value of 1800 tons( <br /> acre foot was used in the absence of specific gravity data <br /> and because it closely approximates the average specific <br /> gravity of Colorado coals. <br /> Unmined acreage of seams above old works were excluded <br />' from the reserve estimates because of the relatively thin <br /> interval between seams and the age of the old works. Other <br /> <br /> seam areas were excluded because of probable burn and split <br /> coal conditions. <br /> Single seam reserves from 0-1500' of cover were assumed <br /> to have a 50% recoverability; whereas, reserves from 1500- <br /> 3000' were placed at 40% recoverability. Multiple seam <br />' ' <br /> overburden were assigned a 40% recover- <br />reserves from 0-1500 <br />ability and the 1500-3000' reserves were assigned a 33`/, re- <br />coverability. <br />' No attempt has been made to determine a total in-place <br />' or recoverable reserve for the Sunlight property. <br /> <br /> <br />