The Attorney-General has won an appeal seeking to include additional evidence into the Coronial Inquest of three deaths within six weeks at the Mount Lyell copper mine.
The inquest before Coroner Simon Cooper is investigating the deaths of Alistair Lucas and Craig Gleeson, who died after they fell from a wooden platform in December 2013, and that of Michael Welsh, who died in a mudslide in January 2014.
The inquest has been on hold awaiting the Full Court of the Supreme Court's decision.
The documents that form the subject of the appeal were used as source materials for a Worksafe report prepared by mining consultant John Webber into the death of Mr Welsh in the mud slide.
Copper Mines of Tasmania sought to exclude Mr Webber's report, the seven associated reports and his oral testimony, however, the Attorney-General Elise Archer intervened in the matter and successfully appealed to have the information included in the inquest.
A cross-appeal by CMT to dismiss Mr Webber's report and oral testimony was dismissed by the Full Court.
The Full Court ruling sets aside a 2018 judgement of Justice Stephen Estcourt which prohibited the inclusion of the seven other documents on the basis it would be unfair to the applicant for Mr Webber, not being their author of the material, to speak of their contents.
CMT argued Mr Webber's report failed to comply with the principles applicable to expert evidence and, therefore, it was denied procedural fairness.
Chief Justice Alan Blow noted Mr Webber had more than 40 years experience in the mining industry, having obtained a degree in mining engineering in 1975, but he had never been engaged as an expert witness before.
"In a number of respects, his report did not take the form that a report by an expert witness should take," Chief Justice Blow said.
Mr Webber's report into Mr Walsh's death included information about safety and the mine, the nature of the terrain, staffing movements and other information relevant to the incident.