Water management in mining

thumb|Gated entrance of an abandoned adit near Medford, Oregon, United States

outflow of acidic water produced by sulfide oxidation from metal mines or coal mines

thumb|Penstocks at the Ōhakuri Dam, New Zealand A penstock is a sluice or gate or intake structure that controls water flow, or an enclosed pipe that delivers water to hydro turbines and sewerage systems. The term is of Scots origin, and was inherited from the earlier technology of mill ponds and watermills, with penstocks diverting pond waters to drive the mills.

water that collects in a mine and which has to be brought to the surface by water management methods