OREAS 220 was prepared from a blend of Archean greenstone-hosted Wilber Lode primary ore from the Andy Well Gold Mine, barren Cambrian greenstone and barren Quaternary tholeiitic basalt. Both the greenstone and basalt were sourced from quarries north of Melbourne, Australia. The Wilber Lode is a shear-hosted, narrow vein, quartz lode-style gold deposit situated within the Meekatharra-Wydgee greenstone belt in the Archean Yilgarn Craton of Western Australia. The common primary mineral assemblage, as stated by Mason and Harris (2011, 2012, cited in Hingston et al, 2014), is quartz, calcite, chlorite, fuchsite, pyrite, galena, sphalerite, chalcopyrite and gold. The host rock consists of a complex sequence of Archean meta-basalt and meta-porphyritic rocks derived from a primary mineralogy of albite, actinolite, chlorite, sericite, biotite, calcite, zoisite, muscovite, quartz and titanate. The Andy Well deposit is located approximately 45km north of Meekatharra in the Murchison region of Western Australia.
|Analyte||Certified Value||1SD||95% Confidence Limits Low||95% Confidence Limits High||Method|
|Au, Gold (ppm)||0.866||0.020||0.860||0.873||Pb Fire Assay|
|Au, Gold (ppm)||0.853||0.034||0.839||0.868||Aqua Regia Digestion (sample weights 10-50g)|
|SG, Specific Gravity (Unity)||2.93||0.048||2.90||2.96||Gas / Liquid Pycnometry|
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