The contract covers four terminals at Rio Tinto's two ports in the Pilbara.
Last year those ports shipped a combined 330.1 million tonnes of iron ore and plans are to grow that further.
Under the contract Westug will be responsible for the operations and maintenance of Rio Tinto's 11-vessel tug fleet and four smaller craft.
Westug has also agreed to an enhanced local procurement strategy under the contract focusing on commitments to boost the relativity of Pilbara specific spending and maximise its footprint in the local community.
The towage service provider has run tugs at Dampier and Cape Lambert for Rio Tinto for many years,
Rio Tinto Iron Ore managing director rail, port & core services Ivan Vella said Rio Tinto had a long history of w...