AUTHORS: Mat Brown, Florinio Lazo, Douglas Kirwin, Graeme Corlett
The SWAN Zone at the Mount Elliott deposit is the most significant discovery of IOCG mineralisation in the Mt Isa Inlier since Ernest Henry in 1991, with a combined metal content of 2.3Mt Cu and 4.3MOz Au. The SWAN zone was “re-discovered” during 2006 and known mineralisation, previously traced over a 200m strike length and 150m depth now extends to a depth of 1km and over a strike length of 1.2km. Primary chalcopyrite mineralisation at SWAN is associated with a hydrothermal assemblage of magnetite, hematite-stained albite, clinopyroxene, actinolite, pyrite and calcite that has replaced bands within the host calc-silicate rocks, infilled extensive breccias and formed common late-stage sulphide veins. Recent drilling shows that the SWAN and Mount Elliott deposits are parts of a single large mineralised system, where the mineralisation style and grade are controlled by host rock chemistry and rheology
KEYWORDS: IOCG, Mount Elliott, SWAN, Copper, Gold
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