OREAS 27 has been prepared from rhyodacite material from a quarry approximately 30km east of melbourne. It is characterised by extremely low background gold of less than 1 parts per billion. Seven commercial analytical laboratories participated in the program to characterise (in addition to gold by fire assay) Ag, Al, As, Ba, Be, Bi, Ca, Cd, Co, Cr, Cu, Fe, Hf, K, Li, Mg, Mn, Mo, Na, Nb, Ni, P, Pb, Rb, Sb, Sc, Sn, Sr, Ta, Th, Ti, Tl, U, V, W, Y, Zn and Zr by 4-acid digestion with ICP-OES or ICP-MS finish.
| CRM Code |
Principle Certified Values |
State |
Matrix |
Mineralization |
| OREAS 27 |
Au <1ppb |
Cu 4.61ppm |
Pb 25ppm |
primary |
rhyodacite |
barren |