Bristol is mislabeled as "Zoners" aka dsy_license_ga_sol_grp. They have copper mining bonuses.
As for Junkers, they've had bonuses on mining Premium and Regular Scrap, but in this patch, Premium Scrap got removed, and all scrap fields in Sirius got reactivated to drop regular scrap. Regular scrap is mined at a very high speed, so any bonuses wouldn't really mean anything really. Instead, Junkers have efficiency bonuses on scrap processing refineries on POBs.