The Lethbridge Black Diamonds were a minor league baseball team located in Lethbridge, Alberta, Canada. The team was previously known as the Lethbridge Mounties from 1992–1995 before becoming the Lethbridge Black Diamonds from 1996–1998. They were one of the first two farm clubs of the Arizona Diamondbacks. Only 16 months after Arizona was granted a major league baseball franchise, the first farm club — the Lethbridge Black Diamonds — took the field. The team started playing two years before their parent club even played a game. The team played their first game in June 1996, whereas the Arizona Diamondbacks started playing in April 1998. The team played in the Pioneer League, which is a rookie league, with a shortented season, in Minor League Baseball. Their home stadium was Henderson Stad