The investment will be made via Oresteel Investment Ltd., which owns Assmang.
In January, Sumitomo acquired a 20 percent stake in Oresteel and has since raised it to 29 percent.
By raising it again, to 49 percent this month, its effective interest in Assmang will rise from 8 percent to 13 percent, the report said.
The trading house's total investment in Oresteel will total 45 billion yen, one of the largest outlays in South Africa by a Japanese firm.
Assmang has several mines, with annual output of 6 million tons of iron ore, 3 million tons of manganese and 1 million tons of chrome.
($1 = 107.79 yen)
yasuhiko.seki@thomsonreuters.com
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