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An explanation for the distribution of Broken Hill style mineralization...

ASEG Webinar Title: An explanation for the distribution of Broken Hill style mineralization invoking dense rift-related igneous intrusions. Presenter: Peter Gunn (MSc, PhD) Date of Event: 17th March 2021 ABSTRACT This talk is a revised version of an invited keynote presentation made at a Broken Hill Symposium in 2015. The talk will suggest explanations for: - the gravity field of the Broken Hill area - the distribution and origin of the Ag-Pb-Zn mineralisation - the distribution and origin of the Cu mineralisation - the magnetic field of the Broken Hill area - the original structure of the Broken Hill area - the present structure of the Broken Hill area - the topography of the Broken Hill area - and - gives guidelines for exploring for Broken Hill type deposits. Various workers have suggested that the Broken Hill area originated as a rift that was subsequently metamorphosed and intensively deformed. The presenter agrees with this idea and, based on his experiences with many well studied rifts elsewhere in the world, largely in the context of hydrocarbon exploration, identifies subtleties that do not appear to have been appreciated as applying to the Broken Hill rift.