Jet/Long Ranger/206
Flight Crew Commercial
Flight Crew Last 90 Days 50; Flight Crew Total 2300; Flight Crew Type 2000
Communication Breakdown
Conflict NMAC; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Took Evasive Action
Human Factors; Procedure
We were returning from a transfer flight; still conducting Part 135 operations in BH206 while on approach from the NW into the base at approximately 1045 (cst); a civilian R22  was taking off from an off-airport LZ. I and the crew observed visually the aircraft takeoff and continue to climb to our altitude as we were established on a final into the base. The ADS-B was tracking the aircraft as well; the aircraft continued to fly within 500 feet laterally and 100 feet vertically as we were approximately 100 feet from landing. The R22 was not on any frequencies and our base is not in controlled airspace. No other issues were noted and the R22 continued to fly SE.
BH206 Pilot reported a NMAC with nordo R22 while landing