OREAS 250b was prepared from a blend of gold-bearing oxide ore and barren materials (basaltic scoria, quartz and mudstone). The ore (Wilber Lode) was sourced from the Andy Well Gold Project located approximately 45km north of Meekatharra in the Murchison region of Western 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.
Twenty-six commercial analytical laboratories participated in the program to certify:
- Gold by fire assay;
- Gold by 15-50g aqua regia digestion;
- Gold by 5-200g cyanide leach;
- Full ICP-OES and ICP-MS elemental suites by 4-acid digestion;
- Full ICP-OES and ICP-MS elemental suites by aqua regia digestion.
| CRM Code |
Principle Certified Values |
State |
Matrix |
Mineralization |
| OREAS 250b |
Au 0.332g/t |
Cu 24.7ppm |
Ag 0.073ppm |
oxide |
weathered greenstone |
orogenic lode gold |