OREAS 292 was prepared from a sample of high-grade gold-antimony ore sourced from the Costerfield Operation (owned by Mandalay Resources Ltd) located approximately 10km northeast of the town of Heathcote in Victoria, Australia. Twenty-two commercial analytical laboratories participated in the program to certify the following:
- Au by 25-50g fire assay with AAS or ICP-OES finish;
- Au by 15-30g aqua regia digestion with ICP-MS, AAS or ICP-OES finish;
- Sb by peroxide fusion with ICP-OES or ICP-MS finish (and one laboratory used pressed powder pellet with XRF finish);
- Full ICP-OES and MS elemental suites by 4-acid digestion;
- Full ICP-OES and MS elemental suites by aqua regia digestion;
- Instrumental neutron activation analysis (INAA) for Au on 20 x 85mg subsamples to confirm homogeneity (undertaken by the Australian Nuclear Science and Technology Organisation (ANSTO)).
| |
Analyte
|
Certified Value
|
1SD
|
CRM State
|
Matrix
|
Mineralisation
|
| |
Au by fire assay
|
11.06 g/t
|
0.066
|
primary
|
metasediments
|
orogenic lode gold
|
| |
Sb by Na2O Fusion |
4.54 % |
0.217 |
primary |
metasediments |
orogenic lode gold |