July 18 (Reuters) - Rio Tinto (LON:RIO) Ltd RIO.AX
* Qtrly pilbara iron ore shipments 77.7 mt versus 82.2 mt a year ago
* Qtrly aluminium production 888 kt versus 911 kt last year
* Qtrly pilbara iron ore production 79.8 mt versus 80.9 mt last year
* Share of production in 2017 is unchanged at 48 to 50 million tonnes of bauxite, 8.0 to 8.2 million tonnes of alumina and 3.5 to 3.7 million tonnes of aluminium
* Qrly shipments were impacted by accelerated rail track maintenance
* Qtrly mined copper production 124.7 kt versus 141 kt last year
* Rio Tinto's expected pilbara shipments in 2017, subject to weather, are around 330 million tonnes on a 100 per cent basis.
* In 2017, rio tinto's expected share of mined copper production remains unchanged at between 500 and 550 thousand tonnes
* Guidance for Rio Tinto's expected share of 2017 production for hard coking coal is revised to 7.2 to 7.8 million tonnes due to impact of cyclone Debbie