Coal washed away with water to be sent up to surface & piped to the concentrating mill.
Documentation on file.
CU as jet of water is placed onto coal in mine. Various shots of the coal being washed away with the water to be sent up to the surface and then piped to the concentrating mill. Two shots of the pipes leading to the concentrating mill. Various shots inside the concentrating mill where the coal is separated from the rock and is dehydrated. The production capacity of this hydraulic colliery is equal to ten average mines.