All coal resources reported within the Donkin Lease fall within the underground category. There are no resources suitable for surface mining. Coal resources that are deeper than 700 m rock cover are present at Donkin and would be classified as nonconventional at this stage. Non-conventional resources have not been included in this resource statement. Sterilized resources are those that are unavailable for mining due to environmental or other restrictions. At Donkin, coal within 75 m of an offshore drill hole that intersects the coal seam in question is unable to be mined. For a 2-m thick seam, this equates to approximately 50,000 tonnes of coal. For the three potentially mineable seams, Lloyd Cove, Hub and Harbour, approximately 1.3 million tonnes (Mt) of coal would be sterilized by this legislative requirement. In addition, seams under less than 200 m of solid rock cover were not considered for longwall mining. An estimate of in-situ resources of coal in the three seams where the rock cover is between 100-m and 200-m thick is included in the Inferred category in this report. Bord-and-pillar mining may be possible in parts of these areas, as it has in other submarine mines in the Sydney Coalfield. No resources were estimated for coal under less than 100 m cover.

Access to the Donkin Project Harbour and Hub seam reserves will be through the two existing tunnels and eventually a third tunnel. The Hub Seam will be accessed through two incline drifts driven from the Harbour Seam. The coal will be extracted using the room-and-pillar (bord-and-pillar) mining method using CMs. Secondary extraction of the pillars is proposed. At full production, four CM sections will be in operation. ROM production ranges from 2.4 Mtpa to 3.8 Mtpa with an average of approximately 3.5 Mtpa. There are 101 million in-situ tonnes of Harbour Seam resource and 73 million in-situ tonnes of Hub Seam resource within the indicated boundary. The proposed mine will recover approximately 33% of these ROM tonnes (58 Mt), of which approximately 48 Mt are saleable.

At the proposed rate of production, the mine exhausts the Harbour Seam reserves in 2041 and the Hub Seam reserves in approximately 2046.

The CHPP includes all of the material handling, coal processing equipment and stockpiles necessary to process the 3.5 Mtpa ROM extracted by the mine and produce approximately 2.75 Mtpa of clean saleable coal with quality parameters suitable for sale into international coking and thermal coal market and domestic thermal coal markets. Based on testing of samples mostly collected from the Harbour Seam at the base of the two tunnels, the nominal overall CPP yield based on modeling simulations is 84%, and the yield ranged from 76% to 92%.

The proposed CHPP system involves the following items:
- A raw coal stockpile, reclaim and sizing system to prepare a minus 50 mm raw coal feed to the CPP. - A 650 tonnes per hour (tph) processing plant featuring a single stage large diameter dense medium cyclone to process coal, spirals to process the mid-size material and flotation to beneficiate the fine coal.
- A product sampling and reclaim system to prepare product coal ready for loading onto a barge or rail.
- A dry disposal reject handling system.