On August 10, CMOC fell 3.3% in regular trading, trading at HK$18.49/share, with turnover of HK$319 million. The decline came as prior bullish sentiment surrounding the Democratic Republic of Congo copper-cobalt concentrate export ban faded following institutional reassessment.

CMOC shares had rallied significantly from August 5 to 7, driven by expectations that the DRC export ban would tighten copper supply. However, UBS subsequently issued a report maintaining a Buy rating and stating the ban has limited impact on the company. UBS noted that CMOC's TFM and KFM mines in the DRC produce cathode copper and cobalt hydroxide rather than concentrates, meaning their output falls outside the scope of the ban. Furthermore, over 85% of the DRC's copper exports are already shipped in refined form. With multiple institutions confirming minimal actual supply disruption, earlier optimism dissipated and the stock experienced profit-taking.

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