April 15 (Reuters) - Chinese gold miner Zhaojin Mining Industry on Monday said it is increasing its offer for Australia's Tietto Minerals, now valuing it at A$768.3 million ($497.46 million).

Zhaojin in October 2023 had bid for the Australian gold explorer for about A$629 million. ($1 = 1.5446 Australian dollars) (Reporting by Shivangi Lahiri in Bengaluru; Editing by Leslie Adler)