Changes

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 coalbed 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:energy]]