Leighton subsidiary John Holland secured the 30-month mine operations contract for the Isaac Plains coal mine, about two hours west of Mackay. The work will be provided for Isaac Plains Coal Management, which manages a joint venture between Vale and Aquila Resources Ltd. John Holland will clear, strip topsoil, drill and blast, remove waste, mine and conduct rehabilitation works. The company was already operating under an interim agreement signed in October. The final agreement extended to June 30, 2012.