for shafts) full pneumatic fill was used for gently inclined coal layers, whereas steeply inclined ones were mined with longwall system
, full dry fill and wooden roof support(Piatek and Piatek, 2002).
As it mines across the face, the coal drops onto a face conveyor at the base of the longwall system
. The mine roof above the machine is temporarily supported by hydraulically-operated self-advancing roof supports.
Among the Joy exhibits at MINExpo in October were components of a complete longwall system
, consisting of a J750 ranging arm, line pans 1.50 and 1.75 metre and a medium seam two-leg roof support.
Full production is due to commence in the third quarter of 2001 when installation of its longwall system
has been completed.