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Mining is a better category than "energy"
A drift mine is a type of coal mine that is driven horizontally into [[coal]] that is exposed or accessible in a hillside.
A drift mine is a type of coal mine that is driven horizontally into [[coal]] that is exposed or accessible in a hillside.
In a hydraulic mine, high-pressure water jets break the [[coal]] from a steeply inclined, thick coal bed that would be difficult to mine with the usual underground methods. The [[coal]] is then transported to the surface by a system of flumes or by pipeline.
In a [[hydraulic mine]], high-pressure water jets break the [[coal]] from a steeply inclined, thick coal bed that would be difficult to mine with the usual underground methods. The [[coal]] is then transported to the surface by a system of flumes or by pipeline.
Although currently not in commercial use in the [[United States]], hydraulic mining is used in western [[Canada]].
Although currently not in commercial use in the [[United States]], hydraulic mining is used in western [[Canada]].
[[category:energy]]
[[category:Mining]]