Huoluochaideng site in Inner Mongolia holds rectangular ancient city ruins from Western Han Wu Emperor to Xin Mang period. Excavations in 2012 found three coin hoards and a workshop ruin with thousands of kilograms of mostly Huoquan coins. 2013 dig over 500 square meters uncovered four well-preserved rectangular coin kilns with fire chambers and flame paths. Kiln bricks inscribed with Chinese characters ''六'' and ''土'' likely numbered bricks. Over 150 coin clay models and 20 other moulds found in kilns and vicinity. Models for Xin Mang coins like daquan wushi and xiaoquan zhiyi with nine bearing year inscriptions such as 9 AD. Unearthed coins include daquan wushi, xiaoquan zhiyi, huoquan, banliang, and wuzhu mostly uncirculated. Workshop lasted from 157 BC to 23 AD based on models and coins. Kilns had one or two layers of white hard clay on bottoms. Shallow trench nearby served as drainage system. Four kilns arranged in rectangular workshop first of its kind discovered. Mud brick making areas near workshop. Daquan wushi, xiaoquan zhiyi, and huoquan produced locally. Erdos region economically prosperous then. Finds valuable for Han-Xin currency policy and casting technology.