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• secrlotJ 30 <br />I[J DEX <br /> Titles ~ paQo <br />3.3.3.3 Design Dimensions 3_61 <br />3.3.3.4 Stability Consideration 3-61 <br />3.3.3.5 State Engineer's Approval 3-61 <br />3.3.4 Hydrologic Protection: Refuse Disposal Sites 3-61 <br />3.3.5 Fresh 'dater Ponds 3_64 <br />3.3.5 Hydrologic Protection: Crounduater 3-b4 <br />3.4 Mining Methods 3-b4 <br />3.4.1 Introduction to Mining Methods 3_64 <br />3.4.1.1 Room and Pillar Methods 3-65 <br />3.4.2 Overburden 3_66 <br />3.4.3 Coal Extraction and Handling 3-66 <br />3.4.3.1 Mining Systems 3-56 <br />• 3.4.3.2 Coal Recovery ~ 3-b7 <br />3.4.3.3 Haulage System 3_57 <br />3.4.3.3 a Coal Haulage 3_67 <br />3.4.3.3 b Man and Supply Haulage 3-67 <br />3.4.3.4 Equipment 3-63 <br />3.4.4 Mining Layout 3-71 <br />3.4.4.1 Main Entries 3-71 <br />3.4.4.2 Sub Mains 3-72 <br />3.4.'+.3 Panel Development and Mining 3-7z <br />3.4.4.4 Mining Under Restricted Areas 3_72 <br />3•+.4.5 Bleeder Entries 3-73 <br />3.4.4.6 Barrier Pillars 3-73 <br />3.4.4.7 t4ining Sequence 3 ;q <br />3.4.4.3 Roof and Floor Control 3_74 <br />3.4.5 Coal Development Schedule ;077 <br />3.4.6 Justification for Not Recovering All Reserves 3-77 <br />3.4.7 h1an;.oaer Requirements 3-78 <br />• 3.4.8 Subsidence 3_79 <br />3.5 Area Closure or Abandonment 3-80 <br />