The Collaborative International Dictionary of English v.0.48:

Colliery \Col"lier*y\, n.; pl. Collieries. [Cf. Coalery,
   Collier.]
   1. The place where coal is dug; a coal mine, and the
      buildings, etc., belonging to it.
      [1913 Webster]

   2. The coal trade. [Obs.] --Johnson.
      [1913 Webster]

WordNet (r) 3.0 (2006):

colliery
    n 1: a workplace consisting of a coal mine plus all the
         buildings and equipment connected with it [syn: colliery,
         pit]