Abstract
Using the spatial distribution and composition of alunite-group minerals from surface samples, Scott (1990) has argued that the Mount Leyshon gold deposit in northeastern Queensland formed in an acid-sulfate epithermal system related to a Permian volcanic complex. We maintain that Scott has failed to recognize direct geological and isotopic evidence showing that alunite-group minerals at Mount Leyshon formed during Plio-Pleistocene weathering of a Permian magmatic complex and that he has also overlooked ambiguities in some earlier Rb-Sr isotopic work.
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