AN investigation into what caused potentially-high gas levels at Glencore's Newlands mine is underway.
At 6am all underground workers were evacuated from the mine, which is situated about 30km northwest of Glenden.
A Department of Natural Resources and Mines spokesman said the workers were withdrawn as a precaution.
"Queensland Government mines inspectors were advised that mine management activated the withdrawal at 6am after one atmosphere monitor in a sealed longwall section recorded potentially-high gas concentrations and triggered an alert," he said.
"The affected area is an old underground longwall panel which was recently sealed after it had come to the end of its production cycle.
Mining operations in an adjacent underground longwall were halted as a result of the withdrawal.
"Surface operations elsewhere at the mine site have not been affected," he said.
"Workers will not be permitted to re-enter the underground workings of the mine until a risk assessment has been completed and it demonstrates atmosphere levels are safe for re-entry."
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