Application of Multi-Slicing Highwall Mining System with Stowing at Surface Coal Mine in Thailand

摘要

The Electricity Generating Authority of Thailand (EGAT) Mae Moh coal mine is an open-cut coalrnmine in Thailand that produces about 16 Mt of lignite annually to generate 2400 MW of electricity.rnThe surface mine pit covers is 4 km by 7 km with mining depths ranging up to 260 m. A large pit slopernis formed with the progression of the mining operation. However, massive slides in the pit slopernoccur often due to the existence weak planes such as faults and bedding, and the weak mechanicalrnproperties of the rocks. Hence, 200 m to 300 m boundaries of rock block including coal seams are leftrnin front of faults in order to prevent slides and maintain the stability of the pit slope. As a result, therernare signifi cant coal reserves beneath the abandoned area along the pit slope. Moreover, the minedrncoal seams are very thick and their thickness range from 15 to 30 m.rnThis paper discusses the application of multi-slicing highwall mining system with stowing to thisrnvery thick coal seam left around large pit slopes by means of numerical analysis.