The Liberal premier of Tasmania Peter Gutwein and state resources minister Guy Barnett hit out at activists' latest move to stop the expansion of the Rosebery gold mine.

Activists from the Bob Brown Foundation set camera traps baited with pademelon legs (a wallaby-like mammal) and cat food to obtain video footage of endangered and rare animals on the mine.

The footage was presumably to be used in an advertising campaign protesting the mine's environmental impact.

"It was no surprise to hear that the radical Bob Brown Foundation has since confirmed that the cameras belong to the Foundation," Gutwein and Barnett said in a statement.

"These actions of the BBF are the latest in a series of dangerous or illegal activities from radical protestors as they have, once again, attempted to destroy Tasmanian jobs that have supported the operation of the Rosebery mine for over 80 years."

The Rosebery gold, zinc, copper and lead mine has been operating for more than 85 years but is close to reaching its life without further expansion of the tailings storage facility.

MMG will not be able to grow its mine, which employs around 500 Tasmanians, without expanding the TSF.

The mine has reserves which could see it continue operating for another four decades.

Protest activity is not the only struggle operator MMG is facing at the moment.

Its proposal to expand the TSF is currently before the federal Department of Agriculture, Water and the Environment for assessment.

However, in early June the Department said it would "suspend" its assessment decision on the environmental plan until July.