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:
“The only free road, the Underground Railroad, is owned and managed by the Vigilant Committee. They have tunneled under the whole breadth of the land.”
—Henry David Thoreau (1817–1862)
“In strict science, all persons underlie the same condition of an infinite remoteness. Shall we fear to cool our love by mining for the metaphysical foundation of this elysian temple? Shall I not be as real as the things I see? If I am, I shall not fear to know them for what they are.”
—Ralph Waldo Emerson (1803–1882)