The Oaky Creek North Mine is part of the Oaky Creek coal complex in Central Queensland, Australia, known for producing high-quality coking coal for steel production.
The project faced significant challenges, including a weathered zone extending down to 40 meters and an unsupported shaft diameter below the 2.4-meter minimum requirement. Moreover, constructing a concrete collar cap was essential to support the shaft and fan excavation.
Furthermore, there was a critical safety concern with methane gas at the shaft location, necessitating an effective risk management solution.
MDA addressed these challenges using raise bore drilling and a comprehensive strategy. Initially, an in-depth geotechnical analysis of the weathered zone assessed its impact on shaft stability.
To ensure long-term integrity, steel liners were designed to extend down to 40 meters. Additionally, an integrated collar cap provided critical excavation support.
Moreover, a live trending gas monitoring system was implemented to manage methane levels, ensuring safety for the raise bore drilling team throughout operations.
The project successfully utilised the Engineering, Procurement, and Construction (EPC) model. Specifically, steel liners, tailored to project specifications, were precisely designed, manufactured, and installed, effectively securing the shaft’s structure.
The construction of the collar cap reinforced the excavation support. Most importantly, the innovative gas monitoring system enabled real-time management of methane levels, ensuring safe operational conditions during raise bore drilling.
This case study exemplifies MDA’s ability to deliver comprehensive solutions that meet stringent safety and engineering requirements in complex mining operations.
Design & quality assurance of collar cap
Install drill pipe down existing pilot hole 255m
Back ream of shaft to 2.4m diameter
Design, supply & install steel liners 40LM
Remote shotcrete poor ground & coal seams 75LM
