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e. The area is now shot down exposing the coupling. After <br />shooting, the top is scaled and the area around the coupling <br />will be cleared so that sufficient room for the nut and plate <br />will be obtained. <br />f. The coupling is removed and the plate and heavy hex nut are <br />installed. The coupling, if undamaged, is re-used as is the <br />spin-in bolt. <br />g. Safety precautions will be the same as those stated in the <br />section on resin grouted bolts, and will follow approved <br />roof-support plan for spacing. Installation of plates and hex <br />nuts and clean-up will follow precautions. <br />h. Additional holes may also be drilled for shots. <br />i. It should be noted that overcasts will be shot after mining has <br />passed _and, therefore, these bolts are installed after <br />compliance with the approved roof control plan. <br />L. SAFETY PRECAUTIONS FOR LONGWALL MINING <br />See Figures L-1 through L-9. <br />M. PILLAR AND ENTRY DIMENSIONS <br />Sight lines shall be established to assure that mining projections in <br />entries, rooms, crosscuts, and pillar splits are followed. <br />Entries width 20' maximum <br />Crosscut width 2020 mTimum <br />Room width 20' maximum <br />Room crosscut width 2 maximum <br />Longwall Starting <br />Room Width 28' maximum <br />Centers 50' to 150' <br />Centers 3~b~to 0 <br />Centers 50' to 100' <br />Centers SOTO 100' <br />Crosscut to entry angle 45' to 90° <br />Crosscut may vary from fu l~ to no stagger. <br />G <br />-10- <br />