Tongon is an open pit operation that utilises conventional mining methods. The plant comprises gravity concentration, flash flotation and carbon-in-leach (CIL) circuits. Plant capacity was increased in 2013 from 3.6Mt/a to 4.2Mt/a. Optimisation of the crushing circuit was expected to increase mill throughput further to around 4.5Mt/a. Due to labour disputes and social unrest, the mine struggled to meet production forecasts in 2018. Production through full year 2018 equalled 230koz, with 2019 production guidance between ~280koz and 300koz.