Home | Summary
SUMMARY
Testing of Samples as per Table below using AEISG code testing for reactivity over a period of 7 days.
Conducted For: Hunter Valley Operations
Requested By: Paul Tomkins
Report No.: QMR220724
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 61 sample 9 had greater than trace reactive sulphide as described in Table 3. Samples 5453-9 and 5471-4 tested as marginal when tested as per the AEISG Code of Practice due to no inhibited host material and being acidic. Sample 5471C-03 tested as reactive when tested as per the AEISG code of practice due to being acidic.
Table 4 – Samples containing more than traced reactive sulphide
Figure 1:
When tested as per AEISG Test Sample 5471C-RG03 tested as reactive and contained 1.2% reactive sulphide whereas Sample 5453C-RG09 tested as marginal and contained 3% reactive sulphide. The results are due to sample 5471-RG03 being more acidic that sample 55453-RG09
Figure 2:
AEISG temperature isotherm for test of sample 5471C-RG01, 5471C-RG02, 5471C-RG03 and 5471C-RG03 – note fastest reactive of sample 5471C-RG03 due to sample being most acidic
Figure 3:
AEISG temperature isotherm for repeat test of sample 5471C-RG03 – note fast reactive due to sample being acidic
Figure 4:
AEISG temperature isotherm for test of sample 5453C-RG09
Conclusion:
All samples are not reactive when tested as per the QMR Reactive Ground Test.
The AIESG test results identified sample 5471-RG03 as reactive, sample 5471-RG03 and 5453-RG09 as marginal and all other samples as not reactive. The AEISG test involves an addition of an acidic weathering agent. In the case of of sample 5471-RG03 the weathering agent caused the pH to drop from 5.5 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 reactive sulphide content of sample 5471-RG03 of 1.2% does no have sufficient reative energy to cause a temperature rise in a large blast hole used in coal mining.
References:
QMR Reactive Ground Test: rga3/4/5/7.xlxs, rga8repeats.xlsx, templog3/4/5/7/8.csv
Assessed By:
Dr G. Cavanough
Date:
1st August 2024