Gold precipitation: the Big Picture from micro-chemical processes
Cleverley, James S., Hough, Robert, Ryan, Chris, Maas, Roland, Blake, Kevin, and Nugus, Mike (2009) Gold precipitation: the Big Picture from micro-chemical processes. Proceedings of the 10th Biennial Meeting of the the SGA 2009. 10th Biennial Meeting of the SGA 2009 , 17-20 August 2009, Townsville, QLD, Australia , pp. 213-215.
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Samples of gold-bearing laminated veins from the Sunrise Dam Gold Mine (Western Australia) have been investigated in detail using a combination of advanced imaging and analysis techniques (electron optics, proton-induced x-ray emission, laser ablation). This analysis reveals a very complex chemical and mechanical history recorded at the micro-scale which illustrates the complexity of simple vein systems and the nature of gold precipitation. The laminations represent micro-breccias within a pre-existing quartz-carbonate vein. The gold is hosted by coarse pyrite but is intimately associated with the precipitation of apatite, dolomite, tourmaline-muscovite, rutile and zircon. The chemistry of the apatite, in-situ Sr isotope analysis, the mineralogy of the breccia and the coarse pyrite gold-host indicates that two fluids were present in the system. An oxidised, CO2- rich (water-poor), S-poor fluid with a strong mantle affinity and a water-bearing, reduced S, As, Fe-bearing fluid. The mixing of these two fluids during the cracking of a strong pre-existing quartz vein in a weak sheared host rock led to gold localisation and precipitation.
|Item Type:||Conference Item (Refereed Research Paper - E1)|
Conference theme "Smart Science for Exploration and Mining"
|Keywords:||Sunrise Dam gold mine; gold; strontium; apatite|
|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%|
|Deposited On:||10 Sep 2010 10:58|
|Last Modified:||14 Jun 2013 15:18|
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