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The incident occurred at 12.40am on November 21.
Operations at the mine have been suspended to allow authorities to conduct an investigation.
The worker's family has been notified.
The investigation is being conducted by Queensland Police, the Department of Natural Resources, Mines and Energy and other authorities.
"Coronado offers their deepest sympathies to the family, friends and workmates of the employee," the company said in a statement.
"The company is focused on supporting the family of the employee and workers at Curragh and counselling services are being made available."
In a statement RSHQ said its inspectors were on site starting investigations into the nature and the cause of the incident.
This is the second fatality at Curragh in the past two years.
On January 12 2020 Donald Rabbitt, an employee of a contractor operating a tyre changing facility at the Curragh mine, was killed during a tyre change activity in the main workshop.
Charges have been issued in the Emerald Magistrates Court against Coronado subsidiary Coronado Curragh over Rabbitt's death.
