Abstract
Kushiro Colliery operates with underground mining as one of the largest coal production in Japan, and supplies to power stations with about 25% demand of domestic steaming coal. The colliery produces about 80% raw coal by mechanized longwall mining introduced from 1967 which is composed of Drum Shearer, Shield Supports, A.F.C and Stage Loader.
The large scale production by longwall mining brought into various problems on the safety and productivity such as lower coal recovery ratio, deeper coal fields, and the rise of mining cost.
Kushiro Colliery have been developed new mining techniques accepted hard-ware and soft-ware to improve the coal recovery ratio and to suppress the deeper coal fields. At present, the colliery is strongly performing higher efficiency and safety of mine management by means of the reformation of working systems, the early construction of main roadways for new coal field and intensive transportations, and the completion of safety education.
Realization of various mining techniques have been pulled through the reduction of mining cost and managing inovation on the serious colliery management.
