Lithium Argentina AG

Statistical analysis of check samples – Norlab & SGS

The assay results for check samples between Norlab and SGS fall within a 20% relative difference for lithium, but slightly over 20% for potassium. A RPD over 20% indicate that there may be an issue with the accuracy of one or both laboratories testing methods, but this cannot be determined solely by the RPD value, and further investigation is needed to identify the cause of the discrepancy. The RPD value for lithium of 14.8% is within the accepted 20% cut-off, but still suggests there is some difference between the results obtained by the two labs.

The check samples for both lithium and potassium show a failure rate that exceeds the accepted 10% cut- off. However, one of the three failures for lithium falls only marginally beyond the failure line which, if considered acceptable, would result in a failure rate of 6.9%. In contrast, the failure rate for potassium is 58.6%, with several samples falling beyond the failure line, indicating an unacceptable level of variation.