The BC Coroners' Service says 36-year-old Murray Fadden of Dryden, Ont., and 58-year-old Larry Chorneyko of Arran, Sask., died at the scene Tuesday.
Fadden was driving and Chorneyko was a passenger in the truck on a mine site access track that ran parallel to a conveyor.
The coroners' service says the truck lost control on a steep descent and crashed at the bottom of the track, killing both men.
They were employed at a rock-quarry mining operation called Swansea Ridge Quarry, about 16 kilometres south of Cranbrook.
The coroners' service and B.C.'s inspector of mines are investigating.