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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  • 60g Sachet
CRM Group


Certificate Datapack SDS NRAM (221 KiB)