https://www.nationalgeographic.com/history/article/worlds-oldest-coin-factory-discovered-in-china
minty
Very interesting, thanks for finding that.
The original article is downloadable from https://www.cambridge.org/core/journals/antiquity/article/radiocarbondating-an-early-minting-site-the-emergence-of-standardised-coinage-in-china/178ECC2B245A017BF684BE1EFC732BD1