The wind at the time was reported to be from the south-east at 15 to 20 kt with gusts to 25 kts. The pilot had flown away from a mob of cattle at 50 kts in a south-westerly direction across the wind, to check on some other animals. He then reduced speed and turned left into wind at a height of about 15 ft above ground level. As he was rolling out of the turn, the helicopter sank to the ground. The helicopter cartwheeled forward and came to rest inverted. The aircraft was within weight and balance limits for the flight and was reported to have been operating normally before the accident. The pilot reported having flown 6.4 hours that day.