Small Aircraft; Low Wing; 1 Eng; Retractable Gear
Air Traffic Control Developmental
Air Traffic Control Time Certified In Pos 1 (yrs) 0
Training / Qualification; Situational Awareness; Distraction; Communication Breakdown
ATC Issue All Types; Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Separated Traffic
Human Factors; Procedure
I was training on the radar on Sector 3 and 4 combined. Aircraft Y had been issued weather and NOTAMS and was cleared to initial approach fix for an RNAV Approach into IWD when Aircraft X called for release off same airport.  Aircraft Y distance from the field and speed allowed for use of 3 minute rule for nonradar departure separation; so he was issued a departure clearance and void time with almost 2 full extra minutes as a buffer.As Aircraft Y approached the airport and not receiving initial call from Aircraft X who mussed their void time and didn't respond to multiple attempted transmissions; had to can Aircraft Y's approach clearance; climb him above MIA; and vector him away from the airport. More attempts to communicate with Aircraft X went unanswered. Finally Aircraft X calls airborne; was identified; told of the weather and cleared on course from departure instructions and aircraft Y was recleared for the approach. Separation was never lost.Issue departure clearance with a hold for release instruction. This is much less efficient; but eliminates chances for errors.
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ZMP Controller report of having to cancel an approach clearance into an uncontrolled airport because of an IFR departure that had missed its void time. The Controllers did not have a loss of separation and recommended that they issue a hold for release in the future.