The Bob Brown Foundation is continuing to organise protests against the works, which are aimed at determining whether a site at South Marionoak is suitable for a tailings storage development the company says is needed if the mine and its 500 jobs will continue past 2024.

New Prime Minister Anthony Albanese announced his cabinet on Tuesday, with senior Labor figure Ms Plibersek replacing Liberal deputy leader Sussan Ley in the environment role.

That night, and again on Wednesday, the BBF started to pressure Ms Plibersek over the MMG project.

"We have written to Minister Plibersek inviting her to see the World Heritage value takayna/Tarkine wilderness in North-West Tasmania which includes the nation's largest temperate rainforest and rich Aboriginal heritage," BBF campaign manager Jenny Weber said on Tuesday night.

"Of immediate concern is a completely unnecessary toxic waste dump proposed in the rainforest for which mining giant MMG has prudent and feasible options outside the Tarkine.

"The Minister needs to make that decision by June 10.

"We look forward to the rainforest being saved."

Dr Brown - a former Australian Greens leader, said Ms Plibersek was probably the most senior political figure to take the environment portfolio since Graham Richardson in the Hawke Government.

"It is a sign that the Albanese Government is taking the environment seriously in this age of biospheric breakdown and mass extinction which threatens everyone's future," Dr Brown said.

Comment was sought from Ms Plibersek.

MMG said: "Rosebery mine has been proudly contributing to its local community and Tasmania for over 86 years, producing materials that now, more than ever, are essential to a low-carbon future."

"More than 500 jobs and local suppliers depend on us securing a bright future for the site.

"Rosebery was recently advised that the Department of Water and Environment has decided to review if the existing conditions of our environmental approvals are sufficient to comply with the best environmental standards and outcomes as part of our approved work.

"This is a normal check and balance as part of our already approved works."

It said the mine had already implemented significant safeguards, including mapping trees that could be suitable for masked owl habitat and imposing exclusion zones around them, as part of ongoing works and would continue to work with the department and the community to ensure all the conditions of its approval were implemented.

"We welcome the new Minister's appointment and opportunity to work together with the department as there are many processes and approvals yet to be considered as we are still in the assessment stage to determine if the South Marionoak site is feasible," the company said.

"The current investigations are critical to informing this decision."

The BBF said two people were arrested on Monday while "holding MMG out of their illegal roadworks".

"These illegal works commenced 22 days ago with no action or prosecution forthcoming under the previous government."

MMG has maintained that it has not broken the law.

On May 16, MMG's Rosebery Mine general manager, Steve Scott, said: "It is important to remember that we are still in the assessment stage to determine the technical feasibility of building a new tailings storage facility at South Marionoak."

"There is a long and rigorous process to be followed, including multiple opportunities for the public to have their say, before a new facility can be built."

He said the mine would be forced to close in coming years without a new tailings storage facility.

"We have conducted an exhaustive search for alternatives, including paste fill, which is not safe or suitable at Rosebery due to the age of the mine workings and insufficient capacity underground," he said.

"Minerals from Rosebery, including zinc, copper and lead, are essential in the transition to renewable energy technologies.

"We are committed to achieving a balanced outcome that contributes to a low-carbon future and protects the jobs of the 500 Tasmanians we employ."