The longwall mine has been shuttered since a fire there in September.
Peabody Australia President George J. Schuller Jr said the activities are part of a comprehensive, phased reventilation and safe re-entry plan for the mine.
"Following the reventilation of Zone 1 of the mine, our team is ready to return underground and move us yet one step closer to resuming normal operations," he said.
"We appreciate the dedication and participation of our trained employees, as well as the Queensland Mine Rescue Service, as we continue to advance this process."
The first zone of the mine represents approximately 25% of the area to be re-entered, and the area expected to be least affected by the incident.
Upon re-entering Zone 1, Peabody will assess conditions underground and make any necessary repairs required prior to reventilating Zone 2.