South American focused gold miner, Troy Resources, has crunched the numbers to upgrade the mineral resource estimate at its Karouni gold project in Guyana to a healthy 1,007, 000 ounces from 16 million tonnes grading 2.0 g/t gold. Troy is also on track to produce up to 40,000 ounces this financial year at an all-in-sustaining-cost of between US$1,450 and US$1,550 an ounce.