Bratislava-based oil refinery Slovnaft has resumed full operation following more than two months of planned breaks, company spokesman Anton Molnar has told TASR. A total of 21 production units were gradually shut down in late May. Slovnaft invested over 60 million euros in cleaning, maintaining and modernising them, thereby reducing the environmental burden, increasing the efficiency of producing oil products and boosting the safety of complex technological processes, Molnar said.