The Country Liberals will allow mining in the Limmen Bight National Park and Marine Park, near the Gulf of Carpentaria, if they are elected later this year.

The Northern Territory Labor Government unveiled the boundaries of the parks last week.

But it is not saying yet whether it would allow mining or commercial fishing inside the parks.

Opposition resources spokeswoman Kezia Purick says her party would allow mining and infrastructure for iron ore, gas and oil if projects can clear environmental regulation hurdles.

"Yes, they can co-exist," she said.

"If the bars have to be set higher, they have to be set higher."

Western Desert Resources has already signalled it wants to mine iron ore in the Roper Bar area, which has been excluded from the park boundaries.

It and another miner, Sherwin Iron, had proposed to build an iron ore slurry pipe to a loading facility to be constructed at Maria Island.

This will not be permitted.

It is believed the miners now want to build a sealed haulage road to transport ore to Xstrata's Bing Bong port near Borroloola.

The Limmen area is estimated to contain about 200 million tonnes of iron ore, valued at about $20 billion.

Ms Purick says the Territory and federal governments, and local government, could help with the costs of sealing the 160 kilometre road.

Meanwhile, Indigenous residents say they are worried the government won't say what industries will be allowed in the Limmen Bight Marine Park until after the election in August.

The government has only stipulated that recreational fishing can continue in the park.

It won't decide on other activities until after the park is declared, and then after a consultation process to draw up a management plan.

Marra elder Samuel Evans says many people are confused.

"They won't be told until probably the new government comes in in the Territory," he said.

He says commercial fishermen and crabbers are concerned.