Table 1 Results for Testing using QMR Reactive Ground Test and the AEISG Code of Practice
Prior to testing as per the AEISG Code of Practice each sample was assessed for reactivity risk based on pH, carbonate and the amount of reactive sulphide and coal using the QMR Reactive Ground Test (refer to Table 1 for results of both tests). Sixteen samples were alkaline and the other sample was neutral (but also contained carbonates) which reduces the risk of reactivity. Only sample C12385-ER16 contained a significant amount of reactive sulphide (refer to Figure 1 and Table 1). Sample C12385-ER16 also contained sufficient coal to inhibit a reaction between the nitrates and the sulphide when tested as per the AEISG Code of Practice (refer to Figure 2 and Table 1).
Figure 1 – Microscopic examination identified approximately 10% pyrite
Figure 2-Temperature graphs for all samples over 7 days as per the AEISG Code of Practice showing no temperature isotherms
Conclusion:
None of the 17 samples were found to be reactive when tested as per the AEISG Code of Practice and the QMR Reactive Ground Test.