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Australasian rubies
journal contribution
posted on 2023-05-21, 21:42 authored by Sutherland, L, Graham, I, Harris, S, Khin ZawKhin Zaw, Sebastien MeffreSebastien Meffre, Coldham, T, Coenraads, R, Sutherland, GRubies occur in sporadic deposits across the continental exposures of Australasia, although quite subordinate to sapphires, which are actively mined in a few gem fields. The main ruby finds are in alluvial placer deposits shed from . Cenozoic basalt fields in eastern Australia, where corundum was brought up by eruptions as resistant crystals from underlying crustal and mantle sources. These rubies all show differences in inclusions, trace element signatures and oxygen isotope values reflecting origins from diverse metamorphic bodies. Barrington Tops rubies show intergrowths with sapphirine and Cr-bearing spine! and supplied a ruby mining venture. Cudgegong-Macquarie River Mg-rich high temperature rubies may represent diamond zone indicators. New England zoned rubies are unusual Ga-rich types, different to most rubies in general. Elsewhere, in central and western Australia, a few ruby finds are known in older metamorphic rocks. At Harts Range, ruby crystals in feldspathic lenses within deformed metamorphic schists and gneisses were worked for cabochon and specimen material. At Hokitika, South Island New Zealand, a unique ruby-rich metamorphic rock is worked for ornamental jewellery. Commercial ruby deposits are very limited in Australasia, however, the known ruby finds provide a scientific 'bonanza'.
Funding
Australian Research Council
AMIRA International Ltd
ARC C of E Industry Partner $ to be allocated
Anglo American Exploration Philippines Inc
AngloGold Ashanti Australia Limited
Australian National University
BHP Billiton Ltd
Barrick (Australia Pacific) PTY Limited
CSIRO Earth Science & Resource Engineering
Mineral Resources Tasmania
Minerals Council of Australia
Newcrest Mining Limited
Newmont Australia Ltd
Oz Minerals Australia Limited
Rio Tinto Exploration
St Barbara Limited
Teck Cominco Limited
University of Melbourne
University of Queensland
Zinifex Australia Ltd
History
Publication title
Australian GemmologistVolume
26Issue
5-6Pagination
68-76ISSN
0004-9174Department/School
School of Natural SciencesPublisher
The Gemmological Association of AustraliaPlace of publication
AustraliaRepository Status
- Restricted