Rio Tinto Limited (ASX: RIO) has reported a solid quarter for production, including record output at bauxite operations. Iron ore production was in line with last year, although iron ore shipments were impacted by an acceleration in its rail maintenance program following poor weather in the first quarter. Pilbara operations produced 157.0 million tons (Rio Tinto share 128.7 million tons) in the first half of 2017, 2% lower than the same period of 2016 reflecting adverse weather conditions in the first quarter. Second quarter production of 79.8 million tons (Rio Tinto share 65.0 million tons) was slightly lower than the same quarter of 2016 and 3% higher than the first quarter. At the Silvergrass project, earthworks for the plant have been completed, installation of the conveyor is underway, and full commissioning remains on target for the fourth quarter of this year. Rio Tinto expects Pilbara shipments to be around 330 million tons in in 2017 (previously between 330 and 340 million tons) on a 100% basis.