March 3 (Reuters) - Rio Tinto (LON:RIO) Ltd RIO.AX :
* Increase to pilbara ore reserves RIO.AX
* Says as at the end of 2015, the estimated iron ore ore reserves increased by 309 mt after depletion from mining
* Says the increases in iron ore ore reserves have been delivered as part of ongoing resource development drilling program
* Source text for Eikon ID:nASX8q7nC1