RU2023734C1 SU5054014A RU2023734C1 RU 2023734 C1 RU2023734 C1 RU 2023734C1 SU 5054014 A SU5054014 A SU 5054014A RU 2023734 C1 RU2023734 C1 RU 2023734C1 Authority RU Russia Prior art keywords gold flotation bacterial leaching silver method Prior art date Application number Other languages