Langlois is an underground polymetallic mine producing zinc, copper and silver. The ore is treated in a 2.5kt/d plant utilising differential flotation to produce separate Cu and Zn concentrates. The mine is owned and operated by Nyrstrar. A number of operational challenges throughout 2015 impacted upon production, including dilution issues at Langlois. Targeted cost controls and selective mine planning have however helped to reduce the unit operating costs substantially, compared with 2014.