Document Type

Conference Paper

Publication Date


Publication Details

I. Gray, Hydraulic Sluiced Longwall Mining without Supports, 11th Underground Coal Operators' Conference, University of Wollongong & the Australasian Institute of Mining and Metallurgy, 2011, 16-21.


A concept for a mining method developed for a series of thin soft sloping seams between competent roof and floor strata is presented. The method proposed has the form of a retreating longwall where the mining method is by hydraulic sluicing. The face is essentially formed by drilling a directionally controlled borehole between gateroads. The directional drilling assembly is then removed from the drill-string and replaced by a jetting bit which is used to sluice the coal from between the borehole and the goaf. The process may then be repeated by drilling another hole parallel to the first and the process of mining operation is repeated.