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The IRCJ baulked on its bail out plan after it was exposed Mitsui had not revealed the full extent of its losses.
Japanese news reports have suggested Mitsui will either sell or dissolve its water processing operations as part of its restructuring plan.
It will also look at requesting additional finance from its main bank.
The assistance plan is in the form of 171 billion yen to Mitsui, including its subsidiaries Mitsui Mining Coke, Mitsui Mining Logistics and Mitsui Coal Mining.
Mitsui Mining was formerly Japan's largest coal producer and has recently diversified into construction materials and machinery sales.
