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belt bolts boreholes Bureau of Mines cable canopy tip caving chain pillar cleans its track coal balls coalbed conveyor is rammed crosscuts Curth Dames and Moore designed Domaine Reflectometry double-acting ram drum face approach face conveyor face equipment FIGURE front-end loader ft/min gage gate roads haulage hazardous ground headgate Herrin Ib/sq Illinois coal basin Illinois State Geological inches Industrial Engineer installed intake air longwall face longwall mining longwall panels mean load density measured Old Ben Coal one-web-back position outby pan line panel-to-panel transfer percent personnel Pillar extraction premining investigation rails recovery room Rend Lake rigging chamber roof control roof pressure roof rock roof shields roof support roof-support system Shale Limestone shearer cleans shearer has cut shield advance shield line shield recovery shields are advanced siltstone stage loader staging room stress meters supply gate surface tail end tail-side tailgate tip and face tons/sq ft Underclay wire mesh yield