A dense network of small intersecting veinlets, mineralising a whole volume of rock rather than a single structure.
A complex network of small veins or veinlets forming a three-dimensional mesh in rock. Stockwork mineralization is common in porphyry and some gold deposits, where multiple generations of veining create economic grades.
Stockworks are how low-grade bulk-tonnage deposits form. Individually the veinlets are trivial; collectively they make a body large enough to mine from surface.