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Japan's Trade Minister Toshimitsu Motegi made the announcement at the Africa-Japan Ministerial Meeting for Resources Development held in Tokyo on Saturday, Japanese news agencies Kyodo and Jiji said.
The financial support is to be channelled through state-run Japan Oil, Gas and Metals National Corp (JOGMEC), reports said.
A number of Japanese firms have been participating in resources projects in Africa, including Mitsui & Co's LNG project in Mozambique and Nippon Steel & Sumitomo Metal Corp's coking coal project also in Mozambique.