The copper story begins in a mountain county but does not end at the mine. A 2022 Yunnan cultural feature describes Huize as a major copper source for Qing coinage and connects northbound transport with the Baoquan and Baoyuan state mints in Beijing. Ore had to be extracted, smelted, assessed, packed and moved through a chain of routes before it could become coin metal.
County history dates the Bao Yun Mint to 1734 and describes Huize as a centre of coin production in the southwest. The mint gives the copper trade a civic address: administration and coinage took place in the county town, while copper moved through a wider upland network.