OREAS 501e

OREAS 501e was prepared from a blend of porphyry copper-gold ores, barren granodiorite and a minor quantity of Cu-Mo concentrate. The ores were sourced from the Cadia-Ridgeway Mines and Northparkes Mine. Both mining operations are located in the Central West of New South Wales, Australia. The barren granodiorite was sourced from the mafic, S-Type, Late Devonian Bulla Granodiorite complex located in northern Melbourne, Australia. Twenty-seven commercial analytical laboratories participated in the program to certify the following:

• Gold via 25-40g fire assay with AAS finish, ICP-OES or ICP-MS finish;
• Gold via 15-50g aqua regia digestion with ICP OES or MS finish and AAS finish;
• 4-Acid digestion for full elemental suite ICP-OES/MS finish;
• Aqua regia digestion for full elemental suite ICP-OES/MS and AAS finish.

Gold by instrumental neutron activation analysis (INAA) on 20 x 85mg subsamples was also undertaken at ANSTO, Australia to confirm homogeneity.