Geology of the Tropicana Gold Project, Western Australia

Doyle, Mark, Gibbs, Duncan, Savage, Jeni, and Blenkinsop, Tom (2009) Geology of the Tropicana Gold Project, Western Australia. In: Proceedings of the 10th Biennial SGA Meeting of The Society for Geology Applied to Mineral Deposits (1), pp. 50-52. From: 10th Biennial Meeting of the SGA 2009, 17-20 August 2009, Townsville, QLD, Australia.

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Abstract

The Tropicana-Havana gold deposit is hosted by Archaean rocks that lie along the eastern margin of the Yilgarn Craton, Western Australia. The Mineral Resource for the project is 75.3 million tonnes grading 2.07 g/t for 5.01 Moz of gold. Gold mineralisation postdates peak granulite-facies metamorphism and formed from variably oxidised, higher temperature (>350°C), silica-undersaturated fluids. Fluid flow in more competent domains was largely controlled by fracture and grain boundary permeability, and was accompanied by selective sulfide and secondary biotite replacement of metamorphic biotite and amphibole. Partitioning of strain into strongly biotite-sericite-pyrite-altered shear planes, dissolution fractures, and around lithons with jigsaw-fit breccia textures, is evident in domains with higher gold grades. Discrete, laterally continuous high-strain sericitebiotite- chlorite±graphite shear zones that bound ore zones are weakly anomalous in gold. Sulfides within the ore zones are dominated by fine pyrite (2-8%, <0.2mm) with minor chalcopyrite, electrum and telluride minerals. Free gold occurs as fine-grained (10-30 μm) inclusions in pyrite and along biotite-sericite fractures in silicate minerals.

Item ID: 15844
Item Type: Conference Item (Refereed Research Paper - E1)
Keywords: gold, Archaean, architecture, structure
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ISBN: 978-0-9805586-8-5
Date Deposited: 01 Oct 2014 03:51
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840105 Precious (Noble) Metal Ore Exploration @ 100%
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