Group 1 - The Hong Kong gold and precious metals sector experienced significant declines, with Chifeng Jilong Gold Mining falling by 13%, Shandong Gold by over 12%, Zijin Mining International by over 10%, and Zhaojin Mining by over 9% [1][6] - Spot gold and silver prices dropped sharply, with spot gold falling below $5,120 per ounce and spot silver below $108 per ounce [3][8] - Several gold-related companies issued risk warning announcements, indicating that their stock prices had significantly deviated from the market index, suggesting abnormal trading fluctuations [3][8] Group 2 - Regulatory bodies, such as the Shanghai Futures Exchange, have raised margin requirements in an attempt to cool down the market, reflecting a strong speculative atmosphere and accumulating short-term risks [3][8]