The Collaborative International Dictionary of English v.0.48:
Coalpit \Coal"pit`\, n. 1. A pit where coal is dug. [1913 Webster] 2. A place where charcoal is made. [U. S.] [1913 Webster]WordNet (r) 3.0 (2006):
coalpit n 1: a mine where coal is dug from the ground [syn: coal mine, coalpit]