regis resources ltd said it expects lower gold output and higher operating costs after a wall slip at its rosemont mine the australian miner said it will likely produce 420000475000 troy ounces this fiscal year down from an earlier estimate of 460000515000 ounces regis said it now expects an all in sustaining cost of between 1425 australian dollars 1022 per ounce and a1500 an ounce from a1290a1365 an ounce previously other operational challenges have limited the miners ability to absorb the loss of highgrade material regis said