WA Labor says it would create a new marine park and a national park in the Kimberley if it wins the March election.

Mark McGowan says a Labor government would create the Great North Kimberley Marine Park and the Fitzroy River National Park to protect the Mitchell Plateau.

He says protecting the Plateau from mining is essential.

"We will commence negotiations with the mining lease holders on the Mitchell Plateau to ensure, overtime, the Mitchell Plateau is put into a national park," he said.

"The Mitchell Plateau is beautiful, it is a beautiful area.

"We would hope that the companies that hold the bauxite leases will reach the understanding that it can't be mined and so we will commence negotiations that no one should ever mine contemplate mining the Mitchell Plateau."

However, the Premier Colin Barnett says the government is already negotiating with mining companies to protect the area.

"Those negotiations are going on and have been going on for two years," he said.