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longwall strata control induced blasting sccl continuous miners wet and dry bulb temperatures air velocities and environmental monitoring working below hfl controlled blasting contractual mining river bund full extraction discentional ventilation co2 flushing spancom nitrogen flushing monitoring curtain removal global warming 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 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 shallow depth