It appears trapped miners Brant Webb and Todd Russell will spend a thirteenth night trapped nearly one kilometre underground.
Rescue workers have found the going tough trying to work through the final 3 metres of rock, reportedly five times the strength of concrete.
Operators of the Beaconsfield Gold Mine are now using low level explosives to help break the two remaining metres of rock, in order to free the miners.
Teams are being careful not to disturb the sensitive area, and cause any more collapses in the mine shaft.
The mine's manager, Matthew Gill says while he is disappointed the men have not yet been freed, they were aware it would be a difficult task.
“We always knew it would take time. We knew the rock was hard. We knew that these were difficult conditions, and we knew that patience would be required.” Mr Gill told reporters.
Mr Gill says that despite the delays, rescuers are confident the rescue will be successful.
But he says the slow progress is having an impact on morale.
“Certainly there was an elevated expectation last night I think that was reflected out here as well. We are trying to and that's why we don't put deadlines on this exercise.
“Certainly people are hopeful, but the reality is this is a long and tricky process that we want to make sure we do safely.” Mr Gill said.