late 14c. (late 13c. as a surname), collere "charcoal maker and seller," agent noun from Middle English col (see coal). They were notorious for cheating their customers. Meaning "digger in a coal mine" is from 1590s. Sense of "coasting-vessel for hauling coal" is from 1620s.
noun suffix, in army, city, country, etc., from Old French -e, Latin -atus, -atum, past participle suffix of certain verbs, which in French came to be used to indicate "employment, office, dignity" (as in duché, clergié).
<a href="https://www.etymonline.com/word/colliery">Etymology of colliery by etymonline</a>
Harper, D. (n.d.). Etymology of colliery. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/colliery