Works will include the overland structure, belting, electrics and an elevated stacker.
A major fall in the waste area may have flushed gas onto the longwall face.
Anglo American makes own call on safety.
Thermal coal represented 5% of earnings across Anglo American.
Plans to restart operations in the second half of 2021.
A fall of ground at Moranbah delayed the completion of a longwall move.
Looking at a way of cutting power to the longwall head if an overpressure incident occurs.
So far investigation not found the ignition source.
The suspension of longwall mining elevates the risk of oxidation of coal.
Grosvenor mine accounted for just 0.5% of QMI safety directives issued over two years.
Rothery points finger at Grosvenor methane levels.
The company was still investigating the cause of the methane ignition at Grosvenor last month.