SUMMARY
Testing of Samples using AEISG code testing for reactivity over a period of 7 days
AUGUST 2022 | QMR28-08-22
Table 1 - Results for Testing using the AEISG Code of Practice
Table 2 - Results for Testing using the QMR Reactive Ground Test
Figure 1- Visible pyrite in sample BYE_RG_06
Figure 2 – Sample BYE-RG_06 showing a reaction occurred during testing as per the AEISG Code of Practice.
Figure 3 – Temperature plot for sample BYE-RG_06 for testing as per the AEISG Code of Practice showing a 4° temperature isotherm after 4 hours.
Figure 4 – QMR Reactive Ground Test plot show only trace reactive sulphide in sample BYE_RG09. Sample does not contain enough sulphide to be reactive
Figure 5 – AEISG test of sample BYE_RG09 showing 1° Temperature isotherm due to no carbonates, trace sulphide and acidic weathering agent used in the AEISG Test.
Prior to testing as per the AEISG Code of Practice each sample was assessed for reactivity risk based on pH, carbonate and amount of reactive sulphide using the QMR Reactive Ground Test (refer to Table 1 and Table 2 for results of both tests). All samples were alkaline which reduces the risk of reactivity. No samples contained carbonates which increases the risk of reactivity. Five samples contained a trace level of reactive suplhide. One samples contained 8.36% reactive sulpide and 5.8% coal which is not enough coal to inhibit a reaction for this sulphide content when tested as per the AEISG Code of Practice Reactivity Screening. Figure 2 shows the “inhibiting” capacity of the coal delayed a reaction for 4 hours and limited the reaction to a 4°C temperature isotherm when tested as per the AEISG Code of Practice.
Conclusion
One sample, BYE-RG_06 was found to be reactive when tested as per the AEISG Code of Practice. All other samples tested as not reactive
References
QMR Reactive Ground Test: rga21.xlsx,templog19.xlxs and templog21.xlxs
AEISG Test: qcoal_BYE_RG_6-reactive.xlxs and AESIG Test QCoal QMR28-08-22.xlsx
Assessed by
Dr G. Cavanough
Date
9th August 2022