Surface and underground methods (drift and fill, sublevel caving) were used during exploitation.
Mario Klanfar , Branimir Janković 2012, 'DEPOSITS AND MINING POTENTIAL OF BENTONITE IN CROATIA', Rudarsko-geološko-naftni Zbornikhttp://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=158817&lang=en. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)