Regional development spokesman Mark McGowan has accused Mr Grylls of acting corruptly in the wake of a $45 million mining bond being lifted.

The bond formed part of the conditions for environmental approval over Mr Palmer's iron ore tenements in the state's north.

Mr McGowan obtained emails from Mr Palmer to Mr Grylls and the Environment Minister Donna Faragher, urging them to change the conditions and avoid the ordinary approvals processes for his $4 billion project.

The Queensland mining magnate is a prominent Nationals supporter, donating $100,000 to the party last year via a wine auction.

Mr Grylls submitted to the legislative assembly on questions on notice that he and key staff met Mr Palmer last year on February 3, April 3, May 29, August 11 and twice this year, on March 26 and May 12.

The EPA's final report was made to Ms Faragher in October 2009.

Mr McGowan said that despite attempts under the Freedom of Information Act to obtain all minutes of meetings and diary notes that took place at those six meetings, Mr Grylls has refused to release them.

"Mr Grylls had senior staff members, competent public servants, present at his meetings with Mr Palmer on every single occasion and he did not mention in my Freedom of Information Act request answer that there were minutes of those meetings and it is inconceivable that no notes were made of those meetings," Mr McGowan said.

"So Mr Grylls has now not complied with the Freedom of Information Act, he has not revealed the content of the meetings with Mr Palmer concerning Mr Palmer's environmental approval. I need to know and the public needs to know, what is Mr Grylls hiding?"

Mr Palmer today claimed Mr McGowan's questions over his lobbying and financial contributions were an attempt to stop people participating in the democratic process.