Certified Reference Material (CRM) OREAS 255 was prepared from a blend of
gold-bearing Wilber Lode oxide ore from the Andy Well Gold Project and barren
Quaternary basaltic scoria sourced from a quarry 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 Archaean 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 weathered Archaean 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. OREAS 254 is one of a suite of five oxide
gold CRMs ranging in gold content from 1.2 to 14ppm.
|Analyte||Certified Value||1SD||95% Confidence Low||95% Confidence High||Method|
|Au, Gold (ppm)||4.08||0.087||4.05||4.11||Pb Fire Assay|
|Au, Gold (ppm)||4.01||0.123||3.95||4.06||Aqua Regia Digestion|
|SG, Specific Gravity (Unity)||2.93||0.055||2.91||2.96||Gas / Liquid Pycnometry|
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