The Collaborative International Dictionary of English v.0.48:

mined \mined\ adj.
   extracted from a source of supply as of minerals from the
   earth. [Narrower terms: deep-mined; exploited;
   strip-mined]
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

strip-mined
    adj 1: mined near the earth's surface by stripping