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VMS

VMS

Volcanogenic Massive Sulphide (VMS) Deposits

WHAT IS VMS?

A volcanogenic massive sulphide (“VMS”) deposit in its simplest form is a series of massive to semi-massive sulphide (Cu, Pb, Zn, +/- Au, Ag) lenses typically formed on or below the sea floor resulting from the circulation of metal-bearing fluids driven by a magmatic heat source. A simplified block model comprises a debris field of collapsed sulphide chimneys (Black Smokers) over an alteration pipe which was the metal bearing fluid pathway. Classic examples have high temperature copper bearing minerals in the vent complex (stockwork / stringer zone) with lower temperature lead and zinc minerals being deposited along the flanks. In the BMC, there is also a large Fe component represented by both pyrite and more local Fe formations, the latter key to some of the discoveries.