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Dmitry E. Saveliev – DSc (Geology and Mineralogy), Professor of the Academy of Sciences of the Republic of Bashkortostan, Institute of Geology of the Ufa Federal Research Centre of Russian Academy of Sciences
16/2, K.Marks st., Ufa, 450077, Russian Federation

Darkhan K. Makatov – Postdoctoral student, Department of Geology and Exploration of Mineral Deposits, Karaganda State Technical University
56, Nazarbaev st., Karaganda, 100027, Kazakhstan

Vasiliy S. Portnov – DSc (Engineering), Professor, Department of Geology and Exploration of Mineral Deposits, Karaganda State Technical University
56, Nazarbaev st., Karaganda, 100027, Kazakhstan 

Ruslan A. Gataullin – Junior Researcher, Institute of Geology of the Ufa Federal Research Centre of Russian Academy of Sciences; Master’s student, Department of Geology, Hydrometeorology and Geoecology, Bashkir State University
16/2, K.Marks st., Ufa, 450077, Russian Federation