The geology and mineralisation of the E31 copper-gold prospect, Goonumbla, N.S.W
Arundell, MC (1998) The geology and mineralisation of the E31 copper-gold prospect, Goonumbla, N.S.W. Research Master thesis, University of Tasmania.
The E31 copper-gold prospect is one of several porphyry or porphyry related prospects that
occur adjacent to the Northparkes Mines site in the Goonumbla district of central N.S.W.
The prospect is hosted by trachyandesitic lavas, volcaniclastic breccias and volcaniclastic
sandstones which have been intruded by a biotite monzonite at depth. Intrusive breccias are
recognised associated with monzonite dykes intruding the volcanic sequence. A post
mineralisation low angle north dipping fault terminates occurs adjacent to the contact of the
monzonite with volcanics.
Three major stages of hydrothermal alteration and veining are recognised. Pre-mineralisation
biotite alteration was the first phase. Extensive K-feldspar flooding and vein style alteration
was associated with bornite and chalcopyrite mineralisation. Sericite-carbonate(± chlorite)
alteration with pyrite± chalcopyrite was associated with minor faults and shears. Regional low
grade metamorphism, localised albitisation, and late stage carbonate veinlet alteration have also
Detailed analysis of geochemical data indicates that Cu/Au mineralisation is associated with
Ag, Te, Hg, and Se. An asymmetric Zn and Mn "halo" anomaly occurs in the hanging wall of
the mineralisation which could be used as a vector to the mineralisation. Geochemical
discrimination of lithological units has identified subtle differences between the monzonite
above and below the low angle fault.
Analysis of sulphur isotopes of the E31 prospect indicates that the sulphur associated with the
mineralisation was derived from an oxidised magmatic .source. The range of the data for
bornite and chalcopyrite at the E31 prospect are broadly similar to the values from E26N and
E48 but overall the numbers are lower. Isotopic zonation may be present within the prospect
but given the small size of the prospect and the limited number of samples collected, zonation
has not been determined.
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