stockwork
noun
1
: a system of working in ore when it lies not in strata or veins but in solid masses so as to be worked in chambers or stories
2
: a body or tract of rock so charged with veinlets, nests, or impregnations of ore and especially tin ore that it can be profitably mined
Word History
Etymology
partial translation of German stockwerk, from stock stick, stump, trunk of a tree (from Old High German stoc) + werk work