sentences:  However, in 1977 came the first major success for the club, when they achieved the promotion to the Yugoslav First League.In the following 1977–78 season, the club relegated in the Yugoslav Second League, but managed to achieve the 1977–78 Yugoslav Cup final, where they lost against NK Rijeka by 0–1 after extra time.During this period, the clubs nickname "Rudari" (The Miners) was especially popular, and the Trepča players Dragan Mutibarić, Dragan Simeunović and Vladan Radača became members of the Yugoslav national football team.