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SUMMARY

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

APRIL 2024 | QMR080424

Conducted For: Thiess – Olive Grove Complex

Requested By: Alistair Buchanan

Table 1 - Sample Densities

Table 2 – Samples Received

Table 3 - Results for Testing using the AEISG Code of Practice

Table 4 - 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 16 sample 6 had greater than trace reactive sulphide as described in Table 3. Sample TO1-7 tested as marginal when tested as per the AEISG Code of Practice.

Table 5 - Sample TO1-4, TO1-5, TO1-7, TO1-9 and TO1-11 Isotherms on heating due to low pH and TO1-6 having no isotherm due to high carbonates.

Table 6 – 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 TO1-7 as marginal. The AEISG test involves an addition of an acidic weathering agent. In the case of of sample TO1-7 the weathering agent caused the pH to drop from 8 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 1% sulphide content of sample TO1-7 does no have sufficient reative energy to cause a temperature rise.

References:

• Test data files: rga10. xlxs, templog9.csv, templog10.csv templog12.csv

Assessed By:

Dr G. Cavanough

Date:

15th April 2024