Surprised blythefan has not popped up today, here is a little reading to help captain out, vein of stringer sulphides is the hint in today's news
The term "massive sulphide" relates to rocks which consist of >50-60% sulphide minerals. VMS deposits form as lens-like or tabular bodies usually parallel to the volcanic stratigraphy or bedding. They are often underlain by a stockwork zone of vein or stringer sulphides, which form either perpendicular to the volcanic stratigraphy or sometimes parallel to it. These stringer zones may be related to faults and fractures which were present at the time of VMS formation.
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