longwall strata control sccl continuous miners induced blasting resin bolting guttering horizontal stress fore poling techniques roof response time horizon control cavity roof clay bg supremacy of longwall technology mechanisation of ug mines thick seam mining thin seam mining steepness life cycles reserves powersupports resin bolting system pur injections mechanised bolters chemical anchor innovstive roof supports truss supports cable bolting dump management emp planatation water treatment top soil management water pollution air pollution global warming curtain removal monitoring nitrogen flushing spancom co2 flushing discentional ventilation full extraction river bund contractual mining controlled blasting working below hfl environmental monitoring air velocities and wet and dry bulb temperatures cooling power of air ventilation sub surface temperature surface temperature quantative and qualitative survey hydraulic run periodic weighting leg pressures main weighting leg closures dynamic weighting subsidence bulk caving shallow depth
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