RU2069235C1 SU5001855A RU2069235C1 RU 2069235 C1 RU2069235 C1 RU 2069235C1 SU 5001855 A SU5001855 A SU 5001855A RU 2069235 C1 RU2069235 C1 RU 2069235C1 Authority RU Russia Prior art keywords gold pulp coal extraction leaching Prior art date Application number Other languages English (en) Inventor