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TABLE 1 <br />• ROCK QUALITY DESIGNATION(1) <br />CORE SAMPLES OF ROOF MATERIAL <br />• TAKEN FROM DRILL HOLE SL-21 <br /> Modified(2) <br /> Core Run Recovery Recovery R.Q.D. <br />Material Interval Length Inches X Inches RQD% Description <br /> <br />Roof Zone 3 210'-213.67' 44" 44" 100X 43" 97.7X Excellent <br />Roof Upper Pinnacle 405'-408.17' 38" 38" 100% 27" 71.1% Fair <br />Roof Lower Pinnacle 432'-455.08' 277" 249" 89.9% 152.5" SS.1X Fair <br />(1) Rock Quality Designation (R.Q.D.) - method of classifying in-situ rock <br />based on core logging. <br />• 0-25% <br />25-50% <br />50-75% <br />75-90% <br />90-100% <br />very poor <br />poor <br />fair <br />good <br />excellent <br />Source: SPBs Mining Engineering Ilandbook, Volume 1, Page 6-17;• <br />(Society of Mining Engineers of the American Institute of <br />Mining, Metallurgical, and Petroleum Engineers, Inc.); <br />('-) Length of pieces intact core 4" or greater. <br /> <br />-, /9? <br />D. H. EMLING COMPANY <br />