A pilot escaped injury after his helicopter crashed Monday evening at the Pogo mine near Delta Junction.
Anchorage television station KTUU says the crash occurred a day before the first anniversary of a similar crash that killed a man.
According to National Transportation Safety Board investigator Clint Johnson, Monday's crash occurred around 6pm.
He says the Hughes 500-D was carrying a "sling load" when the aircraft apparently had an engine failure, landed in some trees, and rolled over.
The aircraft is operated by Wasilla-based Soloy Helicopters.
The wreckage was taken to Anchorage, where NTSB officials say they can further investigate what may have caused the crash.