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Location: 73 km SW from Bundaberg Central, Queensland, Australia
Swindon RoadMount PerryQueensland, Australia4671
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The Mt Rawdon gold deposit is a massive, volcaniclastic and dacite hosted, low grade gold deposit. The gold mineralisation is closely associated with fine disseminated pyrite within the host rocks as well as more discrete sulphide veinlets. The host rocks at Mt Rawdon are interpreted to be part of the Carboniferous aged, Aranbanga Volcanic Group that unconformably overlies rocks of the Curtis Island Group and is intruded by Permo-Triassic granitoids. Gold mineralisation at Mt Rawdon appears to be coincident with Triassic magmatism.The host rocks at Mt Rawdon have been interpreted to be the product of a diatreme which intruded through the surrounding Devonian to Carboniferous, Curtis Island Group metasedimentary sequence. The host rocks are comprised of a polymict volcaniclastics, grading into monomict dacitic volcaniclastics and coherent dacite intrusions.Gold mineralisation is predominantly hosted in pyrite, associated with zoned hydrothermal alteration, progressing from a highly pervasive inner calc-sodic altered core outwards to a sodic, then distal propylitic alteration. The general shape of the mineral deposit is a slightly elongated and flattened ellipse with the major direction plunging moderately to the southwest and extending for approximately one kilometre, the semi-major direction dipping to the west and having a width extending approximately five hundred metres, and thickness of approximately three hundred metres. Lithology is believed to have a strong control on mineralisation, with poorly mineralised coherent volcanic units flanking the deposit on the east and west and mineralisation being preferentially hosted in pumice bearing breccias and brecciated volcanics. The deposit is cross-cut by a suite of barren post-mineralisation dykes ranging from basaltic-andesitic to rhyolitic in composition, which range in thickness from less than a metre to approximately twenty metres. The deposit has not yet been closed off by drilling at depth down dip but does appear to narrow substantially.Gold mineralisation at Mt Rawdon is associated with minor sulphides (sphalerite, chalcopyrite, bornite, arsenopyrite, pyrrhotite and galena) and takes the form of disseminated sulphides, veinlets and clots within the brecciated and altered host rocks. It is estimated that seventy percent of the sulphides occurs as clots and disseminations with an additional 30% of mineralisation being associated with a later phase of dilatant veining consisting of quartz, carbonate, hornblende, sphalerite and galena. The gold deposit has been interpreted as a south-west plunging spheroidal body, with extents that can be broadly defined by fine-grained white mica, chlorite and carbonate alteration assemblages that lies within the Eastern Dacite and Volcaniclastic units.The Mineral Resource area encompasses the mineralisation domain (i.e. modelled 0.1 g/t Au envelope) which has a moderate southerly plunging ovoid shape with approximate dimensions of 900m (north) by 700m (east) and has been defined over a 650m vertical extent between the 260mRL and -400mRL.
