Police hope to hand over the Pike River coal mine to the company's receivers next week.
Inspector Mark O'Connor says police have to ensure all the gear is working properly before the handover is completed.
That gear includes sophisticated gas analysis equipment and nitrogen manufacturing devices.
While the handover has been delayed a few times, Inspector O'Connor says the police have worked their way through the process as quickly as they can.
He says technical information collected through an existing bore is now being examined.
Another bore is being completed and one more is planned.
Twenty nine men died in the mine after an explosion on 19 November.