A pilot escaped injury after his helicopter crashed at a mine near Delta Junction.
The crash happened Monday evening at the Pogo Mine.
National Transportation Safety Board investigator Clint Johnson says the Hughes 500D was carrying a sling load when it went down just after 6 p.m. Monday.
The aircraft is operated by Wasilla-based Soloy Helicopters.
Johnson says the helicopter had an engine failure, landed in trees and rolled over.
The wreckage is being taken to Anchorage, where NTSB investigators can get a closer look.