United Collieries is located in the Hunter coalfields. When operational, United extracted the Woodlands Hill coal seam. The majority of coal produced from the mine was processed on site at the Coal Handling and Preparation Plant (CHPP) to export quality semi-soft coking coal for use in the manufacture of steel.

The exploration program undertaken for the United Wambo Open Cut Coal Mine Project (see Project) has identified an additional coal resource of approximately 150 Mt within the target coal seams, within the proposed mining areas bringing the total targeted future coal resource to be recovered as part of the Project to 176 Mt. The high quality of the coal to be mined will allow a range of coal types to be produced including export quality thermal and semi-soft coal which can be used for power generation and steel manufacturing.