0.337 g/t Au (greenstone) OREAS 230 - 1kg

OREAS 230 was prepared from a blend of gold-bearing ore and barren greenstone. The ore was sourced from the Frogs Leg Gold Mine located 19km west of Kalgoorlie in Western Australia. The Cambrian greenstone was sourced from a quarry 145km north of Melbourne, Australia.
Thirty-one commercial analytical laboratories participated in the program to certify the elements shown below. The following methods were employed:

• Gold by fire assay (15-40g charge weight) with AAS, ICP-OES or ICP-MS finish (31 laboratories);
• Gold by aqua regia digestion (15-50g sample weight) with ICP-MS, AAS or ICP-OES finish (22 laboratories);
• Gold by cyanide leach (20-200g) via a variety of cyanide leach methods (LeachWELL tablets, alkaline added sodium cyanide solution and sodium cyanide liquor with LeachWELL powder) with ICP or AAS finish (20 laboratories);
• Gold by Chrysos PhotonAssay on ~350g sample weights (4 PhotonAssay units at 3 installations with two rounds of data reported from 3 of the units);
• Full ICP-OES and ICP-MS elemental suites by aqua regia digestion (up to 25 laboratories depending on the element);
• Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion (up to 25 laboratories depending on the element).