Gold distribution at the E26 porphyry copper-gold deposit, Goonumbla N.S.W.

TL;DRAbstract

The E26 porphyry copper-gold deposit is the largest of several copper-gold deposits discovered to date in the Goonumbla region of central west N.S.W. Cu and Au mineralisation occurs in areas of strong pervasive potassic alteration and quartz veining, associated with a small pipe-like quartz monzonite porphyry (QMP1). The mineralisation occurs both within the porphyry and the covolcanic late Ordovician trachyte-latite lavas and volcanic breccias that it has intruded. The deposit is bounded at depth and to the east by a biotite quartz monzonite, while to the immediate north, is another younger QMP (QMP2) which has stoped out the Cu-Au mineralisation. Several other QMP's occur to the northwest and at deeper levels in the E26 deposit. Copper mineralisation occurs principally as bornite with lesser chalcopyrite and chalcocitedigentite. Two bornite phases have been identified based on colour and mineral associations. Gold occurs principally as fine inclusions in bornite. The sulphides are zo

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