1823 o Oxide processing by VAT leaching using large tanks to dissolve copper, reducing the footprint of the plant and facilitating the closure of the facility o Tailings storage facility construction using non contaminant waste material from the open pit, reducing cost and footprint impact for closure o Use of seawater from the Pacific Ocean for concentrator and leaching processes, saving the use of fresh water from the basin o Automation, process control and asset reliability designed to fit per purpose • Sustainability o Good relationship with the communities around the operation, applying a strong program for local capabilities development in Marcona and Nazca started during the Definition Phase o Creation of hundreds of job positions for local workers (Marcona, Nazca) and several local businesses during construction and operation of the mine o Fairly limited land footprint for minimal impact on biodiversity o Strong governance and high environmental standards since the beginning of the operation, allowing the Copper mark certification for sustainable operation practice • Project Management o The project was developed at full stage-gate from the Selection Phase Study, applying IPR and external reviews for critical components, making it more reliable o A solid execution strategy allowed us to meet the schedule and budget, even as the completion of construction and commissioning were impacted by the pandemic. o Strong project team with good local knowledge of construction contractors and service providers • Transition to operations o Early involvement of the future operations team from the Selection Study Phase. They planned and executed their own pre-stripping and pre-mining activities with an organization fit per purpose, with an active participation in the commissioning and start-up processes o Training and capabilities improvement for the future operators from local communities and employment of well experienced personnel to ensure a fast start-up and ramp-up o Strong administration team assembled from the Definition Phase to ensure the readiness of all the business unit areas to the start of commercial production b) B2 Tin tailings reprocessing ($180 Million Investment). The B2 project is an innovative tailings reprocessing plant located at MINSUR's San Rafael Mining Unit (Puno, Peru) started on 2021. Its objective is to extract tin from old tailings, which represent up to 25% of the company's tin production. • Project Value Management o Strong business case supported applying circular economy principles to reprocess tin from legacy tailings. Capex and Opex estimates, according to MINSUR standards o Capital cost overrun under 1%, and project completion on schedule o Rigorous risk management system, including time and cost provision analysis and change management: This also included investment risk analysis using Montecarlo tools • Technical Management o Resource modeling of stored tailings to be treated as a mine o Tailings storage facility designed with zero water discharge to the environment o Strong pilot test program to define and maximize the tin metallurgical recovery o Opportunity to reduce environmental liabilities for mine closure o Automation, process control and asset reliability designed to fit per purpose • Sustainability o Tailings mining represents a lower safety and health risk for operators
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