During the night shift on August 15, 28-year-old haul-truck driver Daniel Patterson died when he lost control of a fully-loaded Komatsu 830E haul truck and crashed into a windrow on his way from the pit to the crusher.
According to DMIRS, the fatal crash happened because the truck was going too fast to negotiate the gradual turn at the bottom.
The Komatsu 830E is an electric drive truck, not a conventional geared unit.
The ramp is inclined, with a down grade between 8% and 10% and a length from crest to toe of 1250m. There is a gradual right hand curve at the ramp's toe.
On such a ramp the recommended speed limit for a loaded haul truck is 20kph, however, the haul truck recorded a speed on the ramp, of 79kph.