Sept 26 (Reuters) - Cudeco Ltd CDU.AX
* Copper concentrate sales agreement with Mitsui-cdu.ax
* Under agreement Mitsui will prepay US$20 million to Cudeco prior to 30 September 2017
* Under agreement Cudeco will supply copper concentrate to mitsui during period from November 2017 until Sept 2018
* Prepayment will be applied to repay us$15 million to China Minsheng Banking Corp which is due on 30 September
* Entered into copper concentrate sales agreement with Mitsui & Co Ltd