There are four coal seams within the Blair Athol area. The four coal seams numbered from top to bottom and are as follows:
- No. 1 seam which averaged 7.5m thick and has been mined completely;
- No. 2 seam which averaged 1.2m thick and has been mined completely;
- No. 3 seam wich was the main working seam. The seam averaged 29m in thickness, with a maximum thickness of 32m in the south-west and has been mined completely;
- No.4 seam wich ranges in thickness depending on locality within the lease.

The No.4 comprises the 4R seam, the 4U seam and 4 Lower seam.

Dragline and Dozers for waste remowal. Coal mining by truck & shovel.

The CHPP undervent several capital upgrades throughout the 2020 year which delivered higher productivity rates, improved reliability and consistency in yield. The major step change in cost and operability were achived with the introduction of an electric primary jaw crushing module and a new WA500 wheel loader dedicated to CHPP feed duties.