The timber company Gunns has been ordered to pay costs after losing another appeal against the Tasmanian Conservation Trust's legal challenge to the pulp mill.
Gunns appealed against its rejected application to make the trust pay a bond in the event it loses the challenge.
The company wanted the court to hold the trust's cash reserves and public donations pending the outcome.
In the Supreme Court in Hobart, Justice Alan Blow rejected the application.
The trust's Peter Mcglone says he is relieved.
"We're instructing our lawyers to immediately proceed commencing towards trial," he said.
Justice Blow also ordered Gunns to pay the appeal costs which could add up to $10,000.
The trust is arguing permits for the $2.3 billion mill lapsed before substantial commencement.
A Gunns spokeswoman says the company is disappointed by the outcome and will vigorously defend the case.