The ICC said Mitchell breached Article 2.3 of its code when he used inappropriate language as West Indies captain Jason Holder was running between the wickets and in close proximity to him in the 62nd over.
The global body said one demerit point had been added to the 29-year-old’s disciplinary record. When a player reaches four or more demerit points within a 24-month period, they are converted into suspension points, which lead to a ban.
The West Indies suffered a humiliating innings and 134-run defeat before lunch on the fourth day of the clash in Hamilton earlier on Sunday.
The second Test starts at the Basin Reserve on Dec. 11.