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THE RIDGEWAY GOLD-COPPER DEPOSIT: A HIGH-GRADE ALKALIC PORPHYRY DEPOSIT IN THE LACHLAN FOLD BELT, NEW SOUTH WALES, AUSTRALIA—A DISCUSSION

Raymond E. Smith

CSIRO Division of Exploration and Mining, PO Box 1130, Bentley, Western Australia 6102, Australia

E-mail: Raymond.E.Smith@csiro.au

The first 20% of the full text of this article appears below.

Sir: Wilson et al. (2003), in their important paper on the Ridgeway Au-Cu deposit, describe hydrothermal alteration about the Ridgeway porphyry ore system. However, their findings are substantially more valuable if taken into account with the published works on regional burial metamorphism of the district (Smith, 1968, 1969). These works described burial metamorphism of the Ordovician volcanic sequences, including the hosts to the Ridgeway deposit, based on district and regional zonation of secondary mineral assemblages. This discussion briefly presents this context and focuses on the key issue of discriminating the porphyry-related hydrothermal alteration from the effects of burial metamorphism. Because porphyry-related hydrothermal minerals and later metamorphic mineral assemblages can be similar, their discrimination is crucial in mapping alteration styles as vectors in exploration for . . . [Full Text of this Article]

This article has been cited by other articles:

				A. J. Wilson, D. R. Cooke, and B. L. Harper THE RIDGEWAY GOLD-COPPER DEPOSIT: A HIGH-GRADE ALKALIC PORPHYRY DEPOSIT IN THE LACHLAN FOLD BELT, NEW SOUTH WALES, AUSTRALIA--A REPLY Economic Geology, January 1, 2005; 100(1): 177 - 178. [Full Text] [PDF]