The Caval Ridge Mine (CVM) includes two pits: Horse Pit and Heyford Pit.

The CVM is situated on the western limb of the northern Bowen Basin at the southern end of the Collinsville Shelf. The Permian coal measures in the region dip east at three to six degrees. Seam splitting is common at CVM, specifically in the Horse Pit area, and results in local steepening of the coal seam dips. Structurally there is one major fault in the north of Horse Pit and some minor associated faulting.

Economic coal seams occur in the terrestrial Moranbah Coal Measures (MCMs) and consist of approximately 300 m of labile sandstone, siltstone, mudstone, tuffaceous claystone and coal. Underlying the MCMs is the German Creek Formation: a marine influenced formation with quartzose to labile sandstone, siltstone, mudstone and thin coal seams. Overlying the MCMs is the Fort Copper Coal Measures that are characterised by thick uneconomic banded coal seams and tuffaceous sediments.

Remnant Tertiary basalt flows occur in the north of the Horse Pit. Elsewhere, Quaternary sands and clayey sands up to 30 m thick overlay the Permian sequence.

The targeted seams at the CVM and the Horse Pit include all seams that comprise the MCMs exceeding 40 cm in thickness. The primary seam targets at Horse Pit are the Q seam to P seam, the Harrow Creek (H) group of seams, and the Dysart (D) seams. All seams greater than 40 cm are determined to be targets for coking coal productio ........

Caval Ridge is open-cut, using dragline and truck and shovel fleets for overburden removal.

The Caval Ridge includes two pits: Horse Pit (north of Peak Downs Highway) and Heyford Pit (north of Harrow Creek). The Extention Project proposes to extend the footprint of the existing Horse Pit at the Caval Ridge. As a result of identifying efficiencies in mine sequencing and planning, mining activities are currently scheduled to reach the limit of the approved Horse Pit extent during FY2025, with some existing site infrastructure potentially being relocated from 2023. If approved, the extension is projected to extend the mine’s life from the 2030s to the 2050s.

The key mining elements of the Project are summarised below:
· Extension beyond the approved extent of the existing Horse Pit from FY2025, exclusive of Moranbah Airport and the Moranbah Access Road
· Maximum CVM ROM coal production up to 15 Mtpa
· Revised CVM Life of Mine (LOM) to FY2056
· Development of an Out of Pit Dump (OOPD) in the north-west of ML 70403 (commencing in FY2028)
· Continuation of progressive rehabilitation of disturbed areas with the aim of progressing to a final landform design, including a final void of approximately 680ha in the far east of ML 1775 at the conclusion of mining
· Continuation of current open cut mining techniques employed at CVM
· Continuation of progressive disposal of mining waste and CHPP rejects to IPDs
· Continued use of ........

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