deep-mined

from WordNet (r) 3.0 (2006)

deep-mined
    adj 1: of coal, as contrasted with coal obtained from a strip
           mine; "deep-mined coal"

from 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]

from The Collaborative International Dictionary of English v.0.48

deep-mined \deep-mined\ adj.
   taken from an undergrround mine; -- as contrasted with coal
   obtained from a strip mine; as, deep-mined coal.
   [WordNet 1.5]

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