The protesters, who united as the Community Opposing the Destruction of the Environment, said they planned a joint approach from all groups against the pulp mill.

Opponents include Peter Cundall, Tasmanians Against a Pulp Mill, Tasmanian Conservation Trust marine campaigner Jon Bryan, Bass Greens MHA Kim Booth and Pulp the Mill.

Group spokeswoman Dr Lisa Searle said the action was to highlight that it was "the wrong mill in the wrong place" and the community would never let it happen.

Mr Cundall said he did not want or intend to be arrested again over the issue but said Tasmanians were disgusted with the miscarriage of justice by the politicians they had voted in.

"We'll never give up, there will be no pulp mill," he said.

Pulp the Mill's Lucy Landon- Lane said yesterday's protest was the third on the site and plans were in the pipeline for a much larger one with all anti-pulp mill groups.

She said it would be bigger than that held to oppose the Franklin Dam and there would also be an international element.

A spokesman from Gunns questioned the total number of protesters but said no one would be prosecuted for trespassing.

"We respect people's right to protest," the spokesman said.

"We've had a year of serious community consultation and letting the people know the facts about it and what's gone on before."

The spokesman said people could access the company's website and see the submissions it had made to the government.

He said the company hoped the federal government would not oppose its environmental impact management plan, with a decision expected by Environment Minister Tony Burke on Thursday.