Plans to slash nearly 20 per cent of Gujarat NRE's workforce have stalled, due to a dispute over workers' entitlements.
Last month, the troubled miner called for about 90 workers to take redundancy.
Payouts were due to be settled today, ahead of the workers finishing up at the mine next Friday.
But on Thursday Construction, Forestry, Mining and Energy Union district vice-president Bob Timbs said there were outstanding issues related to the voluntary redundancy packages on offer.
"Over the past few days, we have been working through some problems with things like payments schedules and other conditions that the company has given workers.
"We are still working with the company to ensure our members get what they are entitled to under this voluntary scheme," Mr Timbs said.
The company was due to meet on Monday with union members who had expressed interest in taking redundancy.
Once workers signed a redundancy agreement, they would be required to leave the mines by next Friday, Mr Timbs said.
It is unclear if Gujarat will meet its redundancy quota through the voluntary scheme.
In this week's stock exchange update, Gujarat said it had paid all outstanding wages and was paying workers on time after it stopped paying them for five weeks last year.
But Mr Timbs said superannuation entitlements were outstanding.
"Gujarat has a deal with the [Australian Taxation Office] on a payment plan for superannuation, paid back over a 12-month period," he said.