Deep condolences to the familes of those lost. Very sad day for aviation in Canada, and those doing northern flying.
I suspect, but do not know, that the aircraft's DFDR will have only basic (minimum legal) parameters with which to investigate this sad accident.
The relevant CARS governing the number, type, resolution and sampling rates of required parameters required for aircraft of various type certificate and manufacture dates is available
here. Registry details for the aircraft can be found using this
Transport Canada page. "Mark" is the registry of the aircraft, in this case, C-GNWN.