As of 9:15 a.m., the 225-issue Nikkei Stock Average added 57.09 points, or 0.27 percent, from Friday to 21,174.31.
The broader Topix index of all First Section issues on the Tokyo Stock Exchange, meanwhile, gained 4.12 points, or 0.27 percent, at 1,545.33.
Mining, oil and coal product, and electric power and gas-linked issues comprised those that gained the most in the opening minutes after the morning bell.
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