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Abstract
Hylogger-2 reflectance spectroscopy data from two drill holes at the Leven Star gold deposit, provides an insight into the hydrothermal alteration associated with vein sets and faults that host gold mineralisation. The metasedimentary host rock is a biotite-rich hornfels, which overprints a regional greenschist facies metamorphism. Gold mineralisation is associated with quartz (±carbonate) stockwork-breccia zones. HyLogging short-wave infrared reflectance spectra detected carbonates, chlorites, epidote (propylitic: carbonatisation, chloritisation, epidote), muscovite (phyllic/sericitic) and kaolinite, illite, ammonium alunite, montmorillonite and dickite (intermediate argillic alteration) assemblages that were confirmed using petrographic observations, drill core and geochemical data. The gold occurs within a sulfidation halo with carbonate phases (ankerite–siderite–dolomite) in structurally controlled veins and faults, which also host a late Sb–As–Bi–Cu–W assemblage, attributed to an intrusion-related style of mineralisation superimposed on a hydrothermal orogenic gold event.
ACKNOWLEDGEMENTS
The authors wish to thank GBM Resources Limited for their help in initiating this work and acknowledge the support from Neil Norris and Geoff Dean for providing access to drill core and data. This paper is an outcome from a Bachelor of Environmental Science Honours project and thesis undertaken by S. J. T. with the support of the School of Geosciences at Monash University. The authors are also grateful to Helen Lynch and the Werribee Core Library staff at GSV for their discussions and making the HyLogging datasets available for this study. HyLogging, HyLogger, TSG and TSA are trademarks of the CSIRO. AuScope/NCRIS provided funding for the Hylogging facilities used in this research.