DEEP MINING AT SUNAGAWA COLLIERY.

Abstract

Sunagawa Colliery, Japan, has managed to solve many problems since 1914 and the technical innovation took place in 1964 when the colliery employed hydraulic mining. Subsequently, the hydraulic mining has been steadily improved widening the range of its application. The colliery is now working out steeply inclined seams at the depth of 900 to 1000 meters below surface. This paper discusses the results derived from the experience of the deep mining at Sunagawa Colliery.