OREAS 520b

OREAS 520b was prepared from a blend of iron oxide copper-gold ore and magnetite-bearing waste rock (altered, porphyritic, intermediate volcanic rock). The mineralisation is hosted by a breccia comprising strongly altered and replaced felsic volcanic fragments in a matrix largely composed of magnetite, calcite, pyrite, biotite, chalcopyrite, K feldspar titanite and quartz. Accessory minerals include garnet, barite, molybdenite, fluorite, amphibole, apatite, monazite, arsenopyrite, a LREE fluorcarbonate, galena, cobaltite, sphalerite, scheelite, uraninite and tourmaline. Copper occurs as native copper, bornite and chalcopyrite. Gold occurs mainly in the molecular framework of the chalcopyrite. Significant levels of cobalt, molybdenum, rare earth elements and low levels of uranium are also present. The ore and waste materials were sourced from the Ernest Henry Mine located about 38 kilometres north-east of Cloncurry in north-west Queensland.

Anticipated Certification Program

1. Au by 25 to 50g fire assay with an appropriate finish to achieve a 5ppb LLD and reading resolution.
2. Au by 15-50g aqua regia digest with an appropriate finish to achieve a ≤5ppb LLD and reading resolution.
3. Full elemental ICP-OES and ICP-MS suites by 4-acid digestion with over range (>1% Cu) copper by ore grade 4-acid digestion.
4. Full elemental ICP-OES and ICP-MS suites by aqua regia digestion with over range (>1% Cu) copper by ore grade aqua regia digestion.