The ECO score is calculated by monitoring performance at two levels: at each mining operation and, overall for the entire Group using a range of KPIs which reflect the following: – Zero tolerance to non-compliance with discharge limits and environmental incidents, such as spillages – The number of observations received from the environmental regulator in Peru – Good environmental management measured on the basis of: – Water consumption per worker – Amount of non-recyclable waste generated per worker – Proportion of recyclable/industrial waste that is commercialised – Corporate Performance Indicator which tracks the number of compliance inspections that are passed with over These KPIs are reported on a monthly basis by each mining operation and communicated to all Company employees.