RAPID CITY, S.D. (MITCHELLNOW) Sixteen people have been arrested in connection to a drug-trafficking operation in Rapid City and on the Pine Ridge Reservation. All of the suspects are facing various federal drug conspiracy charges. The multi-agency operation called ‘Operation Snowy Ridge’ began Tuesday and continued through Wednesday morning. According to authorities, investigations are currently underway to decide whether anyone who’s been arrested will face any additional charges. For more crime stories from MitchellNow.com, click here.