Wan-li: Year 4, Month 3, Day 7
5 Apr 1576
The Censor Guo Ting-wu, regional inspector of Yun-nan, memorialized: "At the beginning of the dynasty, in the capital there was the Metropolitan Coinage Service and in the various provinces there were the [provincial] Coinage Services. During the Jia-jing reign (1522-66), the [provincial] Coinage Services were closed down and subsequently a general deficiency of coins for the use of the people has been advised. Yun-nan produces copper, but it does not engage in smelting or casting. Meanwhile, it continues to purchase cowries at high prices. Where lies benefit and where lies harm?" The memorial was sent to the Ministry of Revenue which re-submitted it. It was approved that they establish a service [to carry out coin casting].
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 98, page 1094