June 23 (Reuters) - Rio Tinto (LON:RIO) Ltd RIO.AX :
* Asx alert-Rio Tinto completes $2.5 billion gross debt reduction-RIO.AX
* Since start of 2016, co has now reduced nominal value of outstanding bonds from approximately $21 billion to about $9.5 billion
* Early redemption costs are expected to reduce underlying earnings by approximately $180 million in first half of 2017
* Early redemption costs are expected to reduce cash flow from operating activities by approximately $260 million in first half of 2017 Source text for Eikon: ID:nASX68JM5g Further company coverage: RIO.AX