Rio also announced a production delay in its underground project in Mongolia of 16 months to 30 months and its costs are $1.2 billion to $1.9 billion higher. Shares in Rio Tinto (ASX:RIO) closed 0.6 per cent lower at $103.25. Year to date its shares have outperformed BHP and Rio's shares are up 33 per cent, BHP (ASX:BHP) has gained 20 per cent and Fortescue (ASX:FMG) is up 115 per cent. Galaxy Resources (ASX:GXY) has hit record production results from its Western Australian Mt Cattlin project, of 56,460 dry metric tonnes (dmt), greater than its expected target of 45,000 – 50,000 dmt in the June 2019 quarter.