The Integra Underground Project Area is predominantly covered by shallow hillslope-based colluvium, with alluvial based sedimentary deposits in the valley floors. These are in turn sequentially underlain by coal measures of the Vane Subgroup, Archerfield Sandstone and Jerrys Plains Subgroup of the Whittingham Coal Measures. The sequence contains interlayered sandstone, conglomerate, mudstone, siltstone and coal.

Integra Underground mining operations are approved at a maximum extraction rate of 4.5 million tonnes per annum (Mtpa) of run-of-mine (ROM) coal until 31 December 2035 under Project Approval (PA) 08_0101. This approval allows longwall mining of the Hebden, Barrett and Middle Liddell seams to produce high quality, semi-hard coking coal for export. During the 2021 Integra Underground completed the mining of Longwall 16 and commenced the mining of Longwall 17. Surface activities at Integra Underground during the reporting period included the construction of gas drainage wells, pipelines and access roads for Longwall 16, 17 and 18. Rehabilitation was undertaken at eight gas well locations including access tracks and pipelines. Integra Underground will undertake the following mining activities during 2022: • Longwall development within the Middle Liddell Seam using continuous miners; • Longwall mining within the Middle Liddell seam, in Longwalls 17 and 18. Longwall mining is projected to commence within Longwall 19 during 2022 subject to mine planning and production; • Extraction of a maximum 4.5 Mtpa of ROM coal; • Installation, commissioning, and operation of gas management infrastructure for Longwalls 17, 18 and 19, including pads, access tracks and pipelines.

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