If the price keeps falling, the brokerage company will ask you to add a margin. If you don't add margin, the broker will close your warehouse receipt when your margin is insufficient. At this time, you will generally lose at most: 3000 yuan * 10 lot * 10 yuan/ton * 10%=30000 yuan.

If the margin is added continuously, the loss will be: (3,000-1600) * 10 lot *10 ton/lot =140,000 yuan.

(excluding the above fees)