Underground Hydraulic Mining
High-pressure water jets have also been used in the underground mining of coal, to break up the coal seam and wash the resulting coal slurry toward a collection point. The high-pressure water nozzle is referred to as the 'hydro monitor'.
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Famous quotes containing the words underground and/or mining:
“It is in our interests to let the police and their employers go on believing that the Underground is a conspiracy, because it increases their paranoia and their inability to deal with what is really happening. As long as they look for ringleaders and documents they will miss their mark, which is that proportion of every personality which belongs in the Underground.”
—Germaine Greer (b. 1939)
“Any relation to the land, the habit of tilling it, or mining it, or even hunting on it, generates the feeling of patriotism. He who keeps shop on it, or he who merely uses it as a support to his desk and ledger, or to his manufactory, values it less.”
—Ralph Waldo Emerson (1803–1882)