Any Unknown or Unlisted Aircraft Manufacturer
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 1
Communication Breakdown; Human-Machine Interface
Conflict Airborne Conflict; Deviation - Altitude Excursion From Assigned Altitude; Inflight Event / Encounter CFTT / CFIT
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Provided Assistance; Air Traffic Control Issued New Clearance; Flight Crew Took Evasive Action
Airspace Structure; Procedure; Human Factors
Additional documentation for Aspen's need for Class C [Airspace]. Aircraft Y was departing; a VFR (Aircraft X); not talking to ATC; flew into the departure corridor; climbing.  Aircraft Y wasn't able to turn because of the mountains; was flying through a 12;100 foot MVA (Minimum Vectoring Altitude); was given a traffic alert. The VFR (Aircraft X) was at 12;200 feet; climbing; Aircraft Y got an RA and descended from 12;100 feet back into high terrain to 11;700 feet to avoid.  Had ATC been talking to the VFR (Aircraft X); they would have been able to turn Aircraft Y away from the conflict. Aspen needs Class C Airspace to require VFR aircraft flying through arrival and departure areas are talking to ATC.
ASE TRACON Controller reported a Traffic Conflict in Aspen airspace and recommends a change to Class C for the airport to avoid future similar conflicts.