Changes

A '''punch mine''' is a type of small drift [[mine]] used to recover [[coal]] from strip-mine highwalls or from small, otherwise uneconomical, coal deposits.  

A '''punch mine''' is a type of small [[drift mine]] used to recover [[coal]] from strip-mine highwalls or from small, otherwise uneconomical, coal deposits.  

A shaft mine is driven vertically to the coal deposit. A slope mine is driven at an angle to reach the coal deposit.

A shaft mine is driven vertically to the coal deposit. A slope mine is driven at an angle to reach the coal deposit.

[[category:energy]]

[[Category:Mining]]