The Australian Workers Union says it will start talking to mining workers in WA after reaching a landmark deal for Rio Tinto workers in Tasmania.

Workers at Rio Tinto's Bell Bay aluminium smelter in Northern Tasmania now have the right to collectively bargain for pay and conditions after Fair Work Australia ruled in their favour.

The AWU's Stephen Price says workers in WA may benefit from the decision.

"It gives working people the power to bargain collectively to protect their entitlements and conditions," he said.

Lew Fellowes, from Patersons Securities, says the move could spark similar action in WA.

"There's a fair chance or a fair possibility that the actions, and what we are seeing over on the east coast, will extend to the west coast but probably only with regards to the aluminium sector," he said.

"Those that participate in the aluminium industry, they will be watching very closely but obviously, in terms of Rio Tinto's overall operations, they will be looking to do what's best for shareholders in the longer term."

Mr Fellowes says he does not think the deal will alter what happens in the iron ore industry.

"If you do look at the iron ore sector and other sectors they are travelling much better, much stronger as a sector," he said.

Rio Tinto has signed one collective agreement with its rail workers in the iron ore industry in Pilbara.