A box cut is a small open cut created to provide a secure and safe portal as access to a decline to an underground mine. Generally the box cut is sunk until sufficiently unweathered rock is found to permit the development of the decline. The portal is generally made safe with rock bolts, wire mesh, and shotcrete, which prevents accidental rock fal...
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http://en.wikipedia.org/wiki/Box_cut
(from the article `coal mining`) Area mining, applied where the terrain is flat, commences with a trench or `box cut` made through the overburden to expose a portion of the coal ...
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http://www.britannica.com/eb/a-z/b/102
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