Team Logo. The Lethbridge Mounties were a team in the Pioneer League. They were a co-op team. In 1996 they changed their name to the Lethbridge Black Diamonds. Retrieved from "https://prosportsteams.fandom.com/wiki/Lethbridge_Mounties?oldid=16902" Categories: Former PL Teams Teams in Alberta Teams in Lethbridge Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.