The Greens have accused the government and Sustainable Timber Tasmania for sitting on an interim report on the timber company's bid for Forest Stewardship Certification.
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The company initiated its pursuit for certification in 2014 when it was known as Forestry Tasmania.
Previous audit results in 2016 showed the company failed to meet 10 vital criteria for approval.
These included identification of high-value conservation forests, protection protocols around the swift parrot and other endangered species, and operations around old-growth forest harvests.
Auditors visited the state over 10 days in May to meet with the company and stakeholders.
Resources Minister Guy Barnett did not directly respond to questions from the Greens in Parliament on Thursday on whether the government had viewed the interim report on the recent audit or whether the certification had been approved.
He said the government support the company's efforts to gain certification.
"They have been continuing with that effort for a good deal of time," Mr Barnett said.
"There is a lot of work involved, there is a lot of complexity to that."
Greens leader Cassy O'Connor said any failure to achieve FSC certification could be linked to the government's policy to open up informal reserves under the former Tasmanian Forestry Agreement to logging in 2020.
She said FSC certification was in high demand across the global timber market.
"In order to access those markets that are demanding sustainably harvested timber, they need FSC certification," Ms O'Connor said.
"The reason our forestry GBE has not been able to get FSC certification to access those markets is that the auditors have found their logging practices are unsustainable and are impacting on threatened species."
Sustainable Timber Tasmania has been contacted for comment.