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EXHIBIT 15 <br />• <br /> TABLE OF CONTENTS -SUBSIDENCE PREDICTION <br /> PAGE <br /> 1.0 SUBSIDENCE PREDICTION ................................. ..... 1 <br /> 1.1 BACKGROUND OF PREDICTIONS ....................... ..... 1 <br /> Subsidence Engineer's Handbook (SEC) ................... ..... 1 <br /> Empirical Equations ................................... ..... 2 <br /> 1.2 MINING SCHEDULE AND RATE OF SUBSIDENCE .......... ..... 3 <br /> 1.3 SUBSIDENCE MAGNITUDE AND PROFILE ................ ..... 5 <br /> Subsidence Magnitude ................................. ..... 5 <br /> Maximum Subsidence Over Mined Areas ................... ..... 6 <br /> Subsidence Profile .................................... ..... 6 <br /> 1.4 DRAW ANGLES ...................................... ..... 9 <br /> 1.5 BREAK ANGLES ..................................... .... 10 <br /> 1.6 ZONES OF POTENTIAL FRACTURING ................... .... 10 <br /> 1.7 ZONES ALONG OUTCROP BARRIER PILLAR .............. .... 12 <br /> Chimney Collapse Prediction ............................ .... 13 <br /> 1.8 POSSIBLE SUBSIDENCE IMPLICATIONS OF FAULTS ....... .... 16 <br />• 1.9 LONG TERM PILLAR STABILITY ........................ .... 18 <br /> 2.0 SUBSIDENCE IMPACTS ...................................... .... 19 <br /> 2.1 LAND USE .......................................... .... 19 <br /> 2.2 SURFACE WATER .................................... .... 19 <br /> 2.3 GROUND WATER .................................... .... 21 <br /> 2.4 BUILDING AND STRUCTURES .......................... .... 24 <br /> Criteria for Evaluating Impacts to Buildings and Structures ..... .... 24 <br /> Buildings ............................................ .... 26 <br /> Power Lines ......................................... .... 26 <br /> Reservoirs ........................................... .... 26 <br /> Pipelines ............................................ .... 26 <br /> Roads .............................................. .... 26 <br /> Bridges ............................................. .... 26 <br /> Stockponds .......................................... .... 26 <br /> 2.5 LANDSLIDES ........................................ .... 27 <br /> <br />i <br />P2-a y <br />z~~~~o i <br />