"A team of researchers from Zhengzhou University, the Modern Analysis and Computer Center of Zhengzhou University and Peking University, all in China, has found evidence of what appears to be the oldest coin-minting operation ever uncovered. In their paper published in the Cambridge University journal Antiquity, the group describes their discovery and study of coins and minting molds found at a dig site in Henan Province, China, and what they have learned about it."
For the full article: https://phys.org/news/2021-08-china-oldest-coin-making-facility.html