I'm a bit suspicious, several pics in sequence, from different angles, looks like a setup.
If this happened at a strip mining operation(of any type) any mining company that cares about employee safety would do a large scale investigation into the accident. With the lose of a capital asset(the mechanics truck) and the potential for injurys that come from blind spots in a rock truck of that type, they would want to educate more and try to reduce the risk of that type of accident again. With the danger tape strung around the area I'd say this is exactly what is happening.
In those trucks you can't see anything that is less than 15 to 20 feet in front of you. The blind spotting is terrible. Our refuse pile trucks these days have cameras mounted on the 4 corners and monitors in the cab that allows the operator to see in those blind spots.