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MEXICO CITY, Aug 21 (Reuters) - Shares of Grupo Mexico fell by 1.8 percent in early trading on Thursday, the day after Mexico's Congress urged the government to cancel one of the company's mining concessions because of a toxic spill.
The company's shares were down at 46.26 pesos by 0845 local time. (Reporting by Christine Murray; Editing by Lisa Von Ahn)