Chinese archaeologists have discovered the relics of an ancient coin factory after a heavy bout of rain caused an area of ground to collapse.

The large national mint, dating back over 2,000 years, was found at the end of 2017 in the city of Nanyang, central China's Henan Province, experts said earlier this week.

The workshop produced coin moulds as well as two kinds of coins, and could prove valuable in the study of coin-making and the economic system of the period, said Bai Yunxiang, a researcher with the Chinese Academy of Social Sciences.

Items unearthed include copper coins, copper smelting slags, pottery shards, animal bones, and a large amount of coin-mould pieces.

According to Yang Jun, a research fellow with China Numismatic Society, two inscriptions on the moulds suggest that they were used during the reign of Wang Mang, who established the short-lived Xin Dynasty (45 B.C.-A.D. 23).

Detection indicates the ruins cover 100,000 square meters, while only 75 square meters have been excavated.

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