J. P. Medina
Sergo Ordzhonikidze Russian State University for Geological Prospecting
Russian Federation

Juan Pablo Medina Jimenez* — Master’s degree in Geology, postgraduate student at the Department of Geology of Mineral Deposits 

23, Miklukho- Maklaya str., Moscow 117997

P. A. Ignatov
Sergo Ordzhonikidze Russian State University for Geological Prospecting
Russian Federation

Petr A. Ignatov — Dr. Sci. (Geol.-Mineral.), Professor, Department of Geology of Mineral Deposits

23, Miklukho- Maklaya str., Moscow 117997

A. A. Ivanov
Sergo Ordzhonikidze Russian State University for Geological Prospecting
Russian Federation

Andrey A. Ivanov — Cand. Sci. (Geol.-Mineral.), Dean of the Faculty of Geophysics

23, Miklukho- Maklaya str., Moscow 117997

I. V. Vikentyev
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences — IGEM RAS
Russian Federation

Ilya V. Vikentyev — Dr. Sci. (Geol.-Mineral.), Corr esponding Member of the Russian Academy of Sciences, Chief Researcher 

35, Staromonetny lane, Moscow 119017