3D geological models of the Kovdor deposit automatically built by different methods from drillcore bulk-rock chemistry: (A) – by calculations of mineral norms; (B) – by multiple regression; (C) – by artificial neural network; (D) – by logical evaluation. Horizontal section −100 m (top) and cross-section X–X’. Red lines – location of sections. Green dashed line is the zone of dolomite carbonatite veins (Fig. 7). The 3D models were generated by Micromine 2016, commercial license (http://www.micromine.com).