An coronial inquiry into the deaths of three miners at a Queenstown mine in 2013 and 2014 has found they would have been entirely avoidable had basic safety principles been adhered to.
Alistair Lucas, 25, and Craig Gleeson, 45, were working on a maintenance platform at the mine owned by Copper Mines Tasmania on December 2013 when it gave way and the two fell 22 metres to their deaths.
Michael Welsh, 53, died six weeks later in a mudslide, rushed by 1500 cubic metres of material while he operated a loader in the lower levels on the mine.
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Coroner Simon Cooper released his findings on the inquiry on Friday morning, stating each death would have been avoidable had the basic safety principles been followed.
He recommended there be no further use of temporary work platforms like that which led to the deaths of Mr Gleeson and Mr Lucas and that properly designed, engineered and constructed platforms be used instead.
Mr Cooper recommended that all workers be trained in the use of fall arrest equipment and use the equipment in all appropriate circumstances.
"Mr Gleeson's and Mr Lucas' deaths illustrate the critical importance of the development and adherence to appropriate safe operating systems, procedures and protocols," he said.
"This is especially pronounced in an industry such as mining where there are no second chances."
The mine has been in care and maintenance since 2014.
Mr Cooper said if and when the mine was to reopen, evidence at the inquiry suggested it should adopt more modern mining methodologies, such as the use of tele-remote boggers.
"It is evident that CMT have expended significant resources in relation to planning for the safe reopening of the mine, at some unidentified time in the future," he said.
The Welsh family in a statement said they were pleased the coroner's report provided recommendations on improving safety at the mine so no family had to go through what they had been through.
"It's been a pretty emotional morning," they said.
"We are disappointed that it has taken seven years to reach this stage.
"We're also sad that most of the time when anything is coming up, we don't WorkSafe Tasmania, we get informed by Facebook or the media."
Australian Workers Union state assistant secretary Robert Flanagan said he hoped the findings send a message to all employers in all hazardous industries that they needed to be vigilant over adherence to safety systems.
"And they need to ensure they are fit for purpose," he said.
Copper Mines Tasmania said all learnings from the coroner's report would be implemented before a proposed restart of the Mount Lyell copper mine.
CMT project manager Clint Mayes said safety systems and processes would be the subject of a comprehensive review before mining production was recommenced.