The Australian Nuclear Free Alliance says traditional owners, particularly the elderly, are facing increasing pressures from mining companies and governments to lease their land for nuclear development.

The alliance of mainly traditional owners held its annual conference near Alice Springs over the weekend.

Conference co-chair Donna Jackson says the proposed waste dump at Muckaty Station and the Roxby Downs uranium mine in South Australia are of particular concern.

"We're hearing from different people from different states about the pressures on them," she said.

"The old people particularly, and the tricks that companies use to get people to sign and not realising the full impacts of what they're signing, and what that means for their ground water especially."