The accident occurred yesterday afternoon.
According to AAP, the 33-year-old man died after becoming trapped in machinery.
Operations have been suspended while police and relevant authorities investigate.
"Mines inspectors are onsite and an investigation has commenced into the tragic incident that resulted in a death of a mine worker at Curragh coal mine, near Blackwater yesterday," the Queensland Department of Natural Resources, Mines and Energy said.
"Our thoughts are with the family of the worker, colleagues, and the local community."
Coronado and Thiess also extended their deepest sympathies to the family of the victim.
Employees and contractors are being briefed as they arrive onsite for work and Coronado has made counselling services available.
Queensland Resources Council CEO Ian Macfarlane offered condolences to the man's family, friends and colleagues.
"The resources industry is tight-knit, so this tragedy will deeply affect everyone who works in and with the resources community," he said.
"Safety is always the resources sector's number one priority. The industry is working with the Queensland government and unions to ensure an ongoing safety focus to maximise safety across the sector."