Key Takeaways HBM secured approval to increase Constancia's mill processing capacity to 34 million tons annually.Hudbay Minerals can optimize its mine plan and extend Constancia's operational life under the permit.HBM's amended permit includes upgrades to tailings transport and water management infrastructure.Hudbay Minerals Inc. (HBM) announced that it secured the National Environmental Certification Service for Sustainable Investments’ approval to amend its environmental permit in Constancia. This will en ...