Production remains on hold at Copper Mines of Tasmania’s Mount Lyell operation, following the death of two workers on Monday.
The men, Craig Gleeson, 45, and Alistair Lucas, 25, were killed in a mine shaft accident at the site.
Initial communications from the company indicated the operation would be back up and running by dayshift on Tuesday.
But CMT has now revised its earlier comments, stating operations will now remain suspended until further notice.
The ABC reports a mine spokesperson said both employees had young families and were long-time employees at the Tasmanian site.
"First and foremost, our thoughts and heartfelt sympathies really go to the families," he said.
"This is truly devastating for them.
"As you can imagine it's extremely tough…I think devastated doesn't begin to describe it.
"Both the men were members of a fairly tight-knit maintenance team up on site and obviously well-known and involved in the local town and community."
Mt Lyell General Manager Scott Clyde said the company is offering counselling and support services to employees and families.
"Our immediate concern is what further we can do to assist and support the families in this time,” he said.
"We are looking to provide support services in addition to the families, to the immediate families also to employees, who have been traumatised.
"This has been is a shocking event for the people on site…they are obviously greatly saddened."
Investigations into the double fatality are ongoing and Clyde said he would not comment on details of the accident.
"I really can't comment on that, we do use those. I really can't comment on the circumstances of that," he told reporters at Queenstown.
"We are trying to establish some of the detail of what led up to this tragic incident, that is likely to take some time yet. It is literally in its initial stages."
It has been reported the two workers were on level 18 in the mine when they fell about 30 metres to the bottom of the shaft.
"It's a very long distance to fall," he said.