STABILITY MONITORING OF A SUB - LEVEL STOPE THROUGH INSTRUMENTATION IN A MANGANESE MINE IN INDIA
Sub-level open stoping method was implemented on an experimental basis in an underground manganese mine situated in central India. The objective was to evaluate its feasibility as a routine method of mining over the conventional cut and fill stoping method. This paper presents the investigations conducted for stability assessment of the hang wall and the crown pillar during excavation from this experimental stope of 22.5 m length and 33.3 m height. The manganese ore body at this mine was 12 to 20 m thick with a dip of around 75-800. The hang wall consisted of a weak decomposed quartz free schist whereas the foot wall consisted of a strong quartz muscovite schist and quartzite. Multipoint Borehole Extensometers were installed to monitor the hang wall deformation during the excavation from this stope. The crown pillar stability was monitored through acoustic emission sensors. The monitoring results revealed no significant movement of hang wall rock and crown pillar. The stope was successfully excavated in around thirteen months period and remained fairly stable without any backfilling. This study had critically helped the mine management to evaluate the feasibility of sub level open stoping method in the given geo-mining conditions of this mine.
J.C.Jhanwar A.K.Chakraborty
Central institute of Mining and Fuel Research Regional Centre, 3rd Floor, MECL Complex, Seminary Hills, Nagpur - 440 006, India
国际会议
香港
英文
1-4
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）