Operations Perkoa Mine, Trevali Mining Corporation
(2) The technical report entitled Technical Report on the Perkoa Mine, Burkina Faso dated April 12, 2018, is the current technical report for the Perkoa property. (3) The Perkoa Underground Mine Mineral Reserve estimate is reported based on planned stopes with a net smelter return cutoff grade of US100/tonne, with metal prices of: US/lb zinc.