Yong-le: Year 17, Month 8, Day 22
11 Sep 1419
In Jiao-zhi, gold-mining offices were established at Qi-yuan Commandery in Liang-shan Prefecture, Gui-hua Commandery in San River Prefecture and Xuan-guang Commandery in Xuan-hua Prefecture. For each office, a staff of two commissioners and four deputy commissioners was established.
Zhong-yang Yan-jiu yuan Ming Shi-lu, volume 14, page 2152