What is the purity of gold extracted in the middle of Qing Dynasty?

4 1.4% In the Qing Dynasty, "gold was heavily rewarded, gold was used for trading, and even gold was used to pay fines". Although the "gold" in ancient books does not necessarily refer to gold, due to factors such as war, gold production once entered a trough. In the late Qing Dynasty, the ratio of gold production in Northeast China and Mongolia increased significantly. "1888- 1890, the average annual output in the late Qing dynasty reached about 13.5 tons", but by "190 1 year, it dropped to 4.5 1 ton, which was only the peak in the previous period. 19 1 1 year recovered to 15 tons or more (482,000). "