By: Mining weekly

The Marion 8200 dragline, among the largest of its kind in the world, features a boom measuring just over 100 m and can excavate coal to depths of nearly 80 m, while hoisting about 135 t of material in a single scoop.

The refurbishment included the installation of a ‘state-of-the-art’ operator’s cab, integrated computerised offsite camera systems, as well as advanced performance and engine monitoring technology.

Liberty explains that the recommissioning of the dragline marks an important operational milestone in its efforts to restore and strengthen mining operations at Optimum Colliery.

“This a huge milestone in terms of Liberty Coal’s plans to achieve full operational capacity of one-million tons a month for Optimum Colliery. The increase in production rates will directly translate into the creation of more jobs at the mine,” comments Liberty Coal CEO Hlayiseka Chauke.

As part of the refurbishment programme, Liberty explains that structural integrity assessments and nondestructive testing (NDT) were conducted across major load-bearing components to verify compliance with design specifications and operational safety standards.

The dragline’s bucket system, rigging components and fairlead assemblies were also inspected and refurbished to ensure optimal digging performance and reduce wear during high-volume overburden removal operations.

In addition, the project included the servicing of the walking mechanism, slew system and associated lubrication systems to restore full operational reliability.

The company says recommissioning activities were carried out in accordance with Liberty Coal’s engineering standards and mine safety protocols, including comprehensive functional testing of the hoist, drag and swing systems prior to returning the machine to service.

The company says the dragline will play a central role in Liberty Coal’s planned surface mining operations, enabling large-scale overburden stripping to expose underlying coal seams.

Following its return to operating capacity after years of neglect and vandalism, Liberty Coal notes that it expects significantly improved stripping ratios and efficiencies in overburden removal cycles, supporting increased run-of-mine (ROM) coal production once fully deployed.

“The project required careful engineering oversight, specialist technical expertise and close coordination between maintenance, engineering and operations teams. Returning this asset to service strengthens our stripping capacity and supports long-term production objectives,” says Liberty Coal COO Peter Nordin.

The refurbishment programme was executed through collaboration between Liberty Coal’s in-house engineering and maintenance teams and specialist contractors with expertise in large-scale mining equipment.

Liberty Coal says all work was completed under strict safety and quality assurance procedures.

“Our goal is to mine efficiently to ensure the business is sustainable and the jobs created at the mine are also sustainable. The refurbishment of the dragline demonstrates Liberty Coal’s commitment to investment into the mine and investing into the future,” says Chauke.

Liberty Coal says it continues to invest in sustaining capital projects and asset reliability initiatives to ensure its mining fleet operates at optimal performance while maintaining the highest safety and environmental standards.