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 falls from closing access to the decline.
From http://en.wikipedia.org/
Ear Force X41 (XBOX LIVE Chat + Wireless Digital RF Game Audio with Dolby
Headphone 7.1 Surround Sound)
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Ear Force X41 (XBOX LIVE Chat + Wireless Digital RF Game Audio with Dolby
Headphone 7.1 Surround Sound)
by Turtle Beach
[image: Ear Force X41 (XBOX LIVE C...
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