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SUMMARY

TESTING OF SAMPLES USING AEISG CODE TESTING FOR REACTIVITY OVER A PERIOD OF 7 DAYS

april 2024 | QMR08-04-24

Table 1 - Results for Testing using the AEISG Code of Practice:

Table 2 - Results for Testing using the QMR Reactive Ground 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). Of the 66 sample 5 had greater than trace reactive sulphide as described in Table 3. Sample 5417-1 tested as marginal when tested as per the AEISG Code of Practice.

Table 3 – Sample 5417-1 1.7°C Isotherm on heating due to low pH and trace reactive sulphide:

Table 4 – Samples containing more than traced reactive sulphide and the marginal sample:

Conclusion:

All samples are not reactive when tested as per the QMR Reactive Ground Test.

The AIESG test results identified sample 5417-1 as marginal. The AEISG test involves an addition of an acidic weathering agent. In the case of of sample 5417-1 the weathering agent caused the pH to drop form 6 to 2 which resulted in a reaction between the sulphide and nitrates because there was no coal or carbonates to buffer an acidic reaction. The trace sulphide content of sample 5417-1 does no have sufficient reative energy to cause a temperature rise.

References:

• QMR Reactive Ground Test: rga2. xlxs, templog2.csv, templog4.csv templog5.csv

• AESIG Test: data10_21HVOsamples.xlxs, data11hvo35SAMPLES.xlsx and data12hvo11SAMPLES.xlsx

Assessed By:

Dr G. Cavanough

Date:

15th April 2024