Physical and geometric controls on the distribution of magmatic- and sulphide-bearing mineral phases within the Voisey's Bay Ni-Cu-Co deposit, Voisey's Bay, Labrador

摘要

The Voisey's Bay Ni-Cu-Co deposit occurs within fragment-bearing troctolites and olivine gabbros of the Reid Brook Intrusive Complex. The Reid Brook, Discovery Hill, Mini-Ovoid and Ovoid are mineralized zones within the sub-vertical Ovoid dike. The westernmost Reid Brook zone contains disseminated and massive sulphides hosted within the dike and veins in the adjacent country rocks, whereas the Discovery Hill zone is confined to the dike. The Mini-Ovoid is continuous with the Ovoid, and consists of massive to semi-massive sulphides as well as lesser amounts of disseminated sulphides. The Ovoid dike physically links two large troctolite intrusions. In the west, the conduit extends from the top of the Western Deeps sub-chamber to the north margin of the Eastern Deeps chamber. Mineralization of the Eastern Deeps zone is located within a sub-horizontal splay from the main conduit where it is connected to the base of the Eastern Deeps chamber.