Sept 15 (Reuters) - Alumina Ltd AWC.AX :
* Curtailment of remaining Suralco refining capacity
* AWAC expects to incur US GAAP restructuring related charges (after tax) in H2 2015 relating to curtailment of between $108 million and $125 million
* Curtailment is expected to be completed by the end of November 2015
* Says impact of the restructuring charges on an ifrs basis is yet to be determined
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