The state government yesterday gave the eight groups at the negotiating table, who were due to come up with an agreement by yesterday, another two weeks to allow detailed analysis of the impact of their preferred scenario.

Premier Lara Giddings, who last week ruled out any further extensions, said the substantial progress made by the environment, industry and union groups so far convinced her the extra time was worth it.

''This has been a 30-year conflict and I am not prepared to sacrifice the potential for a resolution for the sake of a two-week deadline,'' Ms Giddings said.

Ms Giddings said she had not been told key details of the scenario under consideration, such as the areas to be protected, despite meeting with those involved in the talks for more than an hour yesterday.

Forest Industries Association of Tasmania chief executive Terry Edwards said the modelling was necessary and could not be done until they had settled on a preferred scenario. ``What we're saying is that we are optimistic an agreement can be reached and finalised very quickly but we do need detailed modelling work to be done to make sure that whatever we do put into an agreement is durable, can survive over time and won't produce unintended consequences,'' Mr Edwards said.

''We ask for people to give us this final little bit of space to pull off what may be an extremely momentous decision and agreement for the state of Tasmania.''

Forestry Tasmania will be required to check the resource availability based on the amount of areas to be protected under the preferred scenario. A member of the independent verification group will also be re-engaged to provide further information about the socio-economic impact on communities.

Wilderness Society spokesman Vica Bayley said it was exciting to be so close to an agreement.

''This is something that is groundbreaking in terms of an achievement and we are optimistic we can pull it off.''

Any agreement will require extra money to implement it, on top of the $276 million set aside in the state-federal agreement struck last year.

''We've flagged that there are possibly additional funding asks that will be needed to actually deliver some of the solutions, both to environment, to community and to industry challenges,'' Mr Bayley said.

Federal Environment Minister Tony Burke said he believed there was a chance of an agreement and he had not ruled out committing further funding.

''But we have no interest in brokering the deal for the signatories,'' Mr Burke said. ``If they can sit down and work this issue out around the table we have no hesitation in helping to make it real.''

Earlier in the day, Opposition Leader Will Hodgman called for a state election no matter what the result of the talks.

''Whatever happens today Tasmanians have already lost. This government has no mandate to sell out the forestry industry,'' Mr Hodgman said.