In 1965, by merging the companies "Tara" Belgrade, "Investpromet", "Ogrev" Belgrade, "Drina" Uzice, "Metalkosmet" Pristina and "Invest" Nis, "KOPAONIK" was created.
During the development, the company invested its own funds in the development of new construction material plants and mines throughout Yugoslavia, such as: Mining and Metallurgical Plant Zenica, cement plants: Split, Pula, Novi Popovac, Beocin and Kosjeric, IGM "Trudbenik", "Toza Markovic" Kikinda , "Potisje" Kanjiža, "Polet" Novi Bečej, "Petrovaradin" and others. and thus grew into the largest company in Yugoslavia in the field of its activity, and some of the most important investment facilities that have been sent under construction so far are: Hydroelectric Power Plants "Zvornik", Perućac, Đerdap I and II, Thermal Power Plant "Obrenovac", bridge " Gazela "in Belgrade, housing in New Belgrade, Belgrade - Bar railway, Grand Hotel, National Library, Sports Hall" Boro and Ramiz "in Pristina, road economy, Fiat Car Factory Kragujevac, Andrićgrad in Visegrad and many others.
The company overcame the most difficult moments of the disintegration of Yugoslavia, embargo, hyperinflation, loss of the most important foreign partners without significant scars with its strength, material basis, personnel, strategy, business policy and huge love of employees towards its "Kopaonik".