May 12 (Reuters) - Rio Tinto Plc RIO.L
* Rio Tinto share buyback programme
* As announced rio is conducting a $500 million share buy-back programme to repurchase rio tinto plc's ordinary shares of 10 pence each
* Programme commenced on 1 march 2017 and will end not later than 31 december 2017
* On 1 march 2017, rio tinto entered into separate non-discretionary irrevocable instructions for an aggregate maximum consideration of up to £160 million
* Has today increased aggregate maximum consideration under these instructions to $300 million for period from 1 march 2017 to 28 july 2017. Source text for Eikon: ID:nNDL4lK7jx Further company coverage: RIO.L
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