Abstract
Mitsui-Bibai Colliery is an enterprise covered Nippon Oil Co.'s Koju area and Mitsui Mining Co.'s Bibai area, the former being worked since 1923, but the lattervirgin field. By the consolidation of these areas, entry could be located at the most suitable site, resulting to, bring the greater part of coal seams above adit level and to lay out capital most efficiently. This agreement made five years ago affords a valuable example to investigate rationalized amalgamation of colliery workings.
To arrange for the production of 600, 000 tons per year, developing the annexed coal field, double adit levels 2, 300m. long were started in June, 1929 and reached to coal seam in may, 1931.
All the main roads were driven in the rock and coal is hauled through these roads by 8 tons electric locomotives. The capacity of tub is 2 tons.
The mining system in long wall with chain conveyor.
This installation is one of the modern colliery equipments in Japan.
