Definition of stockwork15 Jul 2018 11:05
Definition of stockwork. 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.
Got that from Google; no need for any further smarty pants/condescending answering; just google and term or word.