Aug 2 (Reuters) - Rio Tinto Ltd (RIO) HY underlying earnings $...

Aug 2 (Reuters) - Rio Tinto Ltd (RIO)

• HY underlying earnings $ 3,941 million versus $1,563 million a year ago
• HY net earnings $3,305 million versus $1,713 million a year ago
• HY sales revenues of $19.3 billion, $3.8 billion higher than 2016 first half
• Declared interim dividend of 110 us cents per share, equivalent to $2.0 billion
• Capital expenditure expected to remain at around $5.0 billion in 2017 and around $5.5 billion in each of 2018 and 2019
• As at HY reduced net debt by $2.0 billion to $7.6 billion
• "Production guidance is unchanged from Q2 operations review"
• Says an increased share buy-back of $1.0 billion in Rio Tinto plc shares by end of 2017.
• Effective tax rate on underlying earnings of approximately 30 per cent expected in 2017
• Heavy rainfall in Australia impacted volumes for iron ore and coking coal, while lower head grades at Oyu Tolgoi led to reduced copper volumes
• "Expects total cash returns to shareholders over longer term to be in range of 40 to 60 percent of underlying earnings in aggregate through cycle"
• Achieved $8.2 billion pre-tax in total operating cash cost improvements and reductions in exploration and evaluation expenditure compared with 2012 base
• Expects total cash returns to shareholders over longer term to be in a range of 40 to 60 per cent of underlying earnings in aggregate through cycle
• Expects Rio Tinto Limited to be in a position to pay fully franked dividends for foreseeable future
• Announces cash generation of $6.3 billion and cash returns to shareholders of $3.0 billion
• Expects additional cumulative free cash flow of $5.0 billion from 2017 to end of 2021 from productivity improvements