NSU says the open-pit extension will add 3.3M metric tons of high-grade ore to the mill, resulting in additional payable production of 470M lbs. of zinc and 52M lbs. of copper, and provides time to advance assessment of the Asheli and Harena underground deposits at Bisha and to consider further open-pit extensions.
NSU owns 60% of Bisha, while the other 40% is held by companies run by the Eritrean government.
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