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EXHIBIT 15 <br />• <br /> TABLE OF CONTENTS -SUBSIDENCE PREDICTION <br /> PAGE <br /> 1.0 SUB SIDENCE 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 ......................................... 7 <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 />PR-$ <br />~~~o~ED <br />Y a5~o3 <br />