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OREAS 229 was prepared from Archean greenstone-hosted Wilber Lode primary ore from the Andy Well Gold Mine. 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.
The approximate major and trace element composition of OREAS 229 is provided in Table 2. The non-certified values contained in this table are the means of duplicate assays from one laboratory.
|Constituent||Certified Value||1SD||95% Confidence Low||95% Confidence High||Method|
|Au, Gold (ppm)||12.11||0.206||12.05||12.18||Pb Fire Assay|
|Au, Gold (ppm)||11.75||0.635||11.46||12.03||Aqua Regia Digestion|
|SG, Specific Gravity (Unity)||2.78||0.063||2.75||2.81||Gas / Liquid Pycnometry|