The two hunters suffered minor injuries and were taken by ambulance to Greymouth Hospital.
The spokeswoman said the RCCNZ responded to two distress beacon activations, and notification from the commercial company that its Hughes 369 helicopter was overdue and should have returned at 9.30am.
"As the RCCNZ was arranging for the Garden City Rescue helicopter from Greymouth to fly to the site it received information from the company about the problem at take-off and that three men were injured," the spokeswoman said.
"Another company helicopter had been flown to the glacier to check the situation and was able to pass on information about what had happened on the ground."