By Oliver Griffin

Rio Tinto PLC (RIO.LN) on Thursday said the mineral resource estimate at its Pilbara iron ore operations in Australia has been upgraded by 3.5%.

The world's second-biggest mining company by market value said the mineral resource estimate at the Pilbara operations was 23.3 million tons as of Dec. 31.

At Dec. 31, 2017, the mineral resource estimate was 22.5 million tons of mineral resources.

Write to Oliver Griffin at oliver.griffin@dowjones.com; @OliGGriffin

(END) Dow Jones Newswires

February 28, 2019 02:53 ET (07:53 GMT)

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