 In 1769 the Yarkent Mint closed its doors and Turfan became the only mint in operation in the Southern Circuit.Initially the "red cash coins" produced in Turfan were the same weight as those previously produced in Yarkant and Aksu but as the supply of copper decreased the weight to 5.595 grams of these Qianlong Tongbao cash coins also decreased in the year 1771, in 1774 this was even further decreased to only 4.476 grams making it equal with the "yellow cash coins" of China proper and Northern Xinjiang.Even in the face of these weight reductions the actual weight of "red cash coins" manufactured in Turfan tended to be around 3.5 grams.