Iron ore miner Fortescue Metals Group is considering selling a small interest in its rail and port infrastructure.

CEO Nev Power said the company is in negotiations with potential investors in Fortescue subsidiary The Pilbara Infrastructure, which owns the miner's rail and port assets.

Talks are being held with "a small group of selected investors", Fortescue said.

Any sale would only be transacted at full and fair market value and on the basis that the current efficiency of infrastructure and mining operations are not impacted, Mr Power said.

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Fortescue Metals Group