16th International Multidisciplinary Scientific GeoConference : SGEM 2016 : science and technologies in geology, exploration and mining : conference proceedings : 30 June-6 July, 2016, Albena, Bulgaria. Volume II, Exploration and mining, mineral processing. Sofia : STEF92 Technology, [2016]. xviii, 1244 stran. ISBN 978-619-7105-56-8.