The three-year deal will start July 1.
Santos supplies around 40% of the state's total domestic demand.
Gold Fields operates the Agnew, St Ives and Granny Smith mines in Western Australia and has the Gruyere joint venture with Gold Road Resources.
Australian independent oil and gas group Santos will supply Gold Fields' three mines in Western Australia with 5.5 petajoules of natural gas from its Varanus Island plant.
The three-year deal will start July 1.
Santos supplies around 40% of the state's total domestic demand.
Gold Fields operates the Agnew, St Ives and Granny Smith mines in Western Australia and has the Gruyere joint venture with Gold Road Resources.
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