The Shanghai Composite dropped 2.48% to close at 4,016 while the Shenzhen Component lost 2.69% to 13,824 on Monday, pushing mainland stocks to four-week lows as heavy losses in mining and technology shares weighed on the market. Mining stocks faced intense selling pressure as gold, silver and other metals extended a second day of declines. Notable losers included Zijin Mining (-8.8%), CMOC Group (-9.2%), Aluminum Corp (-10%), Hunan Gold (-10%) and China Northern Rare Earth (-7.6%). Technology shares also tumbled amid renewed concerns about the sustainability of AI investments, with sharp losses in Zhongji Innolight (-8.9%), BlueFocus Intelligent (-8.4%) and Suzhou TFC Optical (-4%). Meanwhile, a private survey showed Chinese factory expansion accelerated last month, with manufacturers boosting production and loading cargoes ahead of the extended Lunar New Year holiday.