TY JOUR TI METHODOLOGY FOR ASSESSING THE ECONOMIC SUSTAINABILITY OF MINING ENTERPRISES IN REMOTE NORTHERN REGIONS KW mining enterprise KW economic sustainability KW northern regions KW Magadan Region KW integrated index KW investments KW logistics KW risk management KW internal audit KW subsoil use JO MOSCOW ECONOMIC JOURNAL AU Arno, V.V. AU Garifulina, I.Y. PY 2026 IS 11 PB Electronic science