Wiktionary
mineworkings
n. (plural of mineworking English)
Usage examples of "mineworkings".
Streams of once molten rock solidified into clinkery masses—fat, rounded, and branched like monstrous roots where they had flowed out from the central mineworkings into the streets and arcades of the devastated city.
Slag heaps of ancient mineworkings blighted the landscape and the air stank of smoke.