Tasmania Police say they are following a "specific avenue of inquiry" in relation to tree-spiking incidents in May.
Logs with bolts secreted in them went to Karanja Timbers in the Derwent Valley and McKay Timbers at Bridgewater, causing damage to machinery.
Primary Industries Minister Guy Barnett, who was on-site at McKay Timbers in Bridgewater on Friday, said more than 20 spikes were found in some of the logs provided to the business by Sustainable Timber Tasmania.
"These spikes have now been removed and today we can see these cleared logs being processed into high quality Tasmanian timber products for construction and appearance grade timber," he said.
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Mr Barnett said the event showed why the government's workplace protection legislation, before the Legislative Council, was important.
"The Tasmanian Government supports the right to peacefully protest but we must also ensure hard-working Tasmanians can go to work and run their legal businesses free from threats and disruption," he said.
McKay Timbers general manager Brett McKay said it was fortunate the tree spiking incident did not cause devastating injury.
It, however, caused $17,000 in damage to machinery and halted processing momentarily.
Greens leader Cassy O'Connor said previous tree spiking incidents had been proven to be caused by people with logging interests who aimed to see forest conservationists falsely accused.
"There is zero evidence any conservationist has spiked trees in any production forest," she said.
"If (Mr Barnett) has evidence of deliberate tree spiking, he needs to produce it."
A Tasmania Police spokesperson said the investigation in the recent tree spiking was ongoing.
"Detectives [are] currently exploring a specific avenue of enquiry," they said.
"Police remain open to exploring all legitimate and credible lines of enquiry in an effort to identify those responsible."
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