Surface Subsidence Analysis Due to Longwall Underground Coal Mining Method in PT. Gerbang Daya Mandiri, Tenggarong, East Kalimantan

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PT Gerbang Daya Mandiri will apply longwall underground coal mining method on its mine site, which is located in Kutai Region. Hence, surface subsidence would potentially occur at the surface area and consequently subsidence analysis including the likelihoods of subsidence profile, maximum value of subsidence and area of surface subsidence is needed. The analysis reveals that the maximum value that is calculated using empirical formulae of the UK National Coal Board differs to that of numerical analysis using distinct element method and the later also suggests that the coverage area of surface subsidence would be 1.7 × 10^6 m^2.

Papers reported in the 9th International Symposium on "Novel Carbon Resource Sciences" Nov. 2-3, 2012

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