Contonga is an underground Zn Cu Pb Ag mine located approximately 470km from Lima Peru. Following the acquisition of the operation by Nyrstar in 2010 the mill capacity was expanded from 0.66kt/d to 0.99kt/d by 2013 which was achieved ahead of schedule in Q1 2012. In 2015 the Contonga operation was reportedly authorised to process 1 200t/d. In December 2016 subsidiaries of Glencore entered into a share purchase agreement to purchase the Contonga mine from Nystar for US$21 million. The transaction was expected to close in H1 2017.