To test the stability of pulverised gold CRM, IMS placed 4 x 1kg sealed jars of CRM in an upright during a road trip from Perth to the Pilbara region. This was a journey of over 2,000 km, including a component of unsealed roads.
Upon completing the journey, two jars were sub-sampled from the top to the bottom of the jar. 6 x 50g samples were submitted for Au by fire assay to test for gravitational settling within the jars.
The results of the study are presented in Figure 1. The results were tested with regression analysis to confirm if any bias was present. As shown in Table 1, the results demonstrated no significant trend.
The relative standard deviation for all results is 1.6%, which is within the anticipated measurement uncertainty for fire assay analysis.
In summary, no statistically significant gravitational settling was found in the two jars, after extensive travel.
Figure 1: PBS-88 Au> Jar depth (nominal) to Au concentration Au (g/t). Certified 2*SD shown in dotted lines
Table 1: PBS-88 P-value of Regression of depth within the jar to g/t Au concentration
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Independent Mineral Standards – Complexity to Certainty
