Methodological approach to creation of the 3D model of an oval-shaped open pit mineSerik Moldabayev, Bolatbek Rysbaiuly, Zhanat Sultanbekova and Nurzhigit SarybayevE3S Web Conf., 123 (2019) 01049DOI: https://doi.org/10.1051/e3sconf/201912301049