Attempts to revive the mine worker at the scene of the accident failed.
Police and the Queensland Mines Inspectorate have already begun investigations in to the incident which occurred at about midnight last night.
The man was a contractor who was spraying grout on the wall when it collapsed on him, according to reports by the ABC.
Grasstree was one of the most improved mines in Anglo American’s stable before its first fatality in May this year when a worker was believed to have been asphyxiated by noxious gas.
The second Grasstree fatality means 2014 is shaping up as a horror year for the Australian underground coal industry coming on the heels of a tragic wall collapse at Yancoal’s Austar colliery in April which took the lives of two mine workers.