The Tahltan have voted 82 per cent in favour of agreements providing money and employment opportunities tied to the Northwest Transmission Line and a stake in deciding how future economic development will take place on their traditional territory.
The agreements needed 60 per cent of the vote in order for the agreements to be ratified.
The area contains a number of promising mineral properties, including the Red Chris copper deposits owned by Imperial Metals and the Galore Creek copper property owned by NovaGold and Teck Cominco.
The Kitselas and the Metlakatla have also signed impact benefits agreements but last week the Gitanyow said it could not reach a deal with BC Hydro.
The Gitanyow want a land management plan taking in the portion of the line running through its traditional territory.