Documents released by the proponents of the contentious Lake Malbena eco-tourism proposal show they will pay about $6,000 a year in rent to the State Government to run an experience for which they plan to charge about $4,500 per person per trip.

Key points: The proponents of a luxury camp in a Tasmanian national park said they posted details of the lease arrangements with the government on their website to address questions regarding alleged secrecy around the approval process

The proponents of a luxury camp in a Tasmanian national park said they posted details of the lease arrangements with the government on their website to address questions regarding alleged secrecy around the approval process Opponents of the project seized upon the amount the camp's proponents will pay in rent, saying it is "scandalous" and "ridiculously low"

Opponents of the project seized upon the amount the camp's proponents will pay in rent, saying it is "scandalous" and "ridiculously low" The government defended the amount, saying it was "assessed by an independent valuer" and would be reviewed against the market rate to "ensure it is always relevant and appropriate"

Daniel and Simone Hackett, operating as Wild Drake, plan to helicopter guests into the Walls of Jerusalem National Park for a four-day kayaking, bushwalking and fly-fishing experience at Halls Island, a proposal that has caused a furore of opposition from a number of groups, including wilderness advocates, the fishing community and Aboriginal groups.

Their proposal was successful in the Tasmanian Liberal Government's expressions of interest (EOI) process for private tourism opportunities in the state's national parks and reserves, which has been criticised by green groups, anglers and bushwalkers for a lack of transparency.

A map of the proposed camp at Hall's Island, showing camp footprint (pink), existing 1950s hut (aqua), walking path (green) and approximate helipad location, with vegetation protection areas (blue). ( Supplied: Dept Environment and Energy )

On Wednesday, Mr Hackett said he was addressing questions about transparency by posting on his own website information that had been requested as part of the Right to Information process through the Department of Primary Industries, Parks, Water and the Environment (DPIPWE).

The documents include Wild Drake's lease and licence agreement, signed in January 2018, which shows the Hacketts must pay land rent of $1,000 (plus GST) a year to the State Government while the project is being constructed, and $4,000 (plus GST) per year once the development is completed.

A separate lease for the small Halls Hut area stipulates a land rent of $2,000 (plus GST) per year.

The Hacketts' licence fee is $1 per year to the Minister, "if demanded".

Mr Hackett said Wild Drake was open to addressing questions about transparency.

"We want to release any document we can find about the project that concerns people. I think we've done that now," Mr Hackett said.

"And to show that what we're trying to do is small, sympathetic, very appropriate."

Rent is 'scandalous', 'ridiculously low': Wilderness Society

Tom Allen from the Wilderness Society, which has filed an appeal with the Supreme Court against the Hacketts' development permit, described Wild Drake's rent price as "ridiculously low".

"It's impossible to rent a room in Hobart for that amount," he said.

"The idea that you get a World Heritage island for a few thousand dollars a year is, frankly, scandalous and shows how cheaply the State Government values World Heritage wilderness."

Nicole Sommer from the Environmental Defenders Office (EDO) said while Mr Hackett claimed he had released the lease agreements in the interests of transparency, the documents were set to be released after a lengthy right to information (RTI) process anyway.

Ms Sommer said an RTI process seeking copies of the Halls Island leases began in April 2018, and just yesterday the EDO was notified that the Ombudsman had instructed the department to release the lease documents in full.

"The decision of the Ombudsman shows DPIPWE withheld the lease and rents charged with no good reason and at substantial delay — 657 days after the leases were first requested," she said.

"Without the Ombudsman, these leases might never have seen the light of day."

Tom Allen said it was also disturbing that the lease and licence agreement had been signed before the three main planning processes — the state reserve activity assessment, the council development application and federal environmental assessment — were completed.

Rent reviews to ensure 'appropriate' amount, Minister says

In a statement, Environment Minister Roger Jaensch said the "decision on the rental for this site was assessed by an independent valuer".

"The rental amounts are fully reviewed [assessed] to the market rate every five years for the standing camp and every three years for the hut. This ensures that the rental is always relevant and appropriate.

Mr Jaensch said it was "wrong to compare these fees to any other type of rent, such as a residential or commercial building in the suburbs".

"The site and the proposed use are unique, and the rental fee is just one of the proponent's obligations.

"The costs of meeting strict licence requirements for protection and management of the site, in a remote wilderness area, will be far greater than the annual rental fee payable."

Transparency call for opponents

Mr Hackett said he would like to challenge groups such as the Wilderness Society to be as transparent as Wild Drake.

"To tell us who their financial and political backers are, be open and transparent," he said.

"They're spending a lot of money on legal fees right now and pursuing us through the various courts and tribunals and I think it's only fair that the public knows who's funding them."

Mr Allen said the Wilderness Society had members and received donations.

The documents posted by Mr Hackett also include his letters to the head of the Parks and Wildlife Service, expressing concern about the potential environmental impact of a protest at Lake Malbena in December.