The Electricity Generating Authority of Thailand (EGAT) Mae Moh coal mine is an open-cut coal mine in Thailand that produces about 16 Mt of lignite annually to generate 2400 MW of electricity. The surface mine pit covers is 4 km by 7 km with mining depths ranging up to 260 m. A large pit slope is formed with the progression of the mining operation. However, massive slides in the pit slope occur often due to the existence weak planes such as faults and bedding, and the weak mechanical properties of the rocks. Hence, 200 m to 300 m boundaries of rock block including coal seams are left in front of faults in order to prevent slides and maintain the stability of the pit slope. As a result, there are significant coal reserves beneath the abandoned area along the pit slope._x000D_
Moreover, the mined coal seams are very thick and their thickness range from 15 to 30 m. This paper discusses the application of multi-slicing highwall mining system with stowing to this very thick coal seam left around large pit slopes by means of numerical analysis._x000D_
FORMAL CITATION:Hamanaka, A, Sasaoka, T, Shimada, H, Matsui, K, Takamoto, H, Meechumna, P and Laowattanabandit, P, 2010. Application of multi-slicing highwall mining system with stowing at surface coal mine in Thailand, in Proceedings Mine Planning and Equipment Selection (MPES) 2010, pp 719-728 (The Australasian Institute of Mining and Metallurgy: Melbourne).