J L

Senior Engineer with more than 30 years of experience in engineering management, construction, commissioning, and start-up of large-scale mining projects and infrastructure across Latin America. Experienced throughout different stages of the project lifecycle, coordinating interfaces among Engineering, Construction, Operations, Maintenance, contractors, EPCM companies, Engineer of Record, and specialized engineering consultants. Extensive experience in multidisciplinary engineering and construction projects, with significant involvement in Tailings Storage Facilities and associated mining infrastructure.

Direct experience with starter dams and dam raises, CFRD and rockfill construction, mass earthworks, foundations, cofferdams, geomembrane-lined reservoirs, drainage and seepage-control systems, geotechnical instrumentation, QA/QC, construction sequencing, constructability, installation, commissioning, and start-up. Strong background in integrated mine water management, including site water balances, contact and non-contact water segregation, diversion systems, drainage, reclaim water, runoff control, pumping and piping, seepage management, water recirculation, hydraulic infrastructure, and TSF water management.

Experience in high-precipitation mining environments ranging from approximately 1,700 to 3,000 mm/year. Selected water-management experience includes Toromocho, with site water balance, non-contact water management, Central Drain, reclaim pond and seepage-control systems; EMINCAR-Trafigura in Cuba, with water balance, pond management, recirculation and ARD mitigation; and Rio Blanco, Peru, with technical review of the project's comprehensive water-management study. Experienced in engineering supervision and technical review, design criteria and technical specifications, contractor and engineering consultant management, QA/QC, construction sequencing, progress monitoring, cost and schedule control, CAPEX/OPEX support, project controls, as well as resolution of field interfaces and deviations during project execution.

Strong understanding of the interaction between design, constructability, construction, commissioning and operations in greenfield and brownfield projects. Direct participation in commissioning, start-up, optimization, and operational stabilization of major mining projects, including Minas Buenaventura (2001), Cerro Verde (2006), Toromocho (2013), Trafigura (2020), and Teck-QB2 (2022), working with multidisciplinary teams through the transition from construction and installation to operations. Specialist in geotechnical engineering, tailings and associated infrastructure, with experience in TSF/TMF facilities, dam raises, earthworks, hydraulic and drainage systems, water management and water balance, piping, conventional, cycloned, thickened and filtered tailings, and dry stack systems.

Water-treatment and environmental experience includes ARD mitigation and neutralization, cyanide destruction, water-quality management, reclaim

Senior Advisor - Tailings Dam, Water Management & Mining Infrastructure Engineering at PLANPROMIN (2026-01 – Present)

• Responsible for the integrated development of tailings dam engineering and associated water-management infrastructure, incorporating geotechnical, hydraulic, civil, construction and operational criteria.
• Development and control of the site water balance for thickened-tailings facilities, integrating well inflows, reclaim and drain-water recovery, evaporation, water retained in deposited tailings/sands, seepage/infiltration and operational recirculation.
• Development of engineering for non-contact water diversion and surface-water management, including alignment definition and associated hydraulic structures.
• Development and review of basal drains, drainage systems, water-recovery systems and associated pumping requirements, considering geotechnical and hydraulic conditions as well as construction sequencing.
• Engineering of roads, access routes, platforms and civil works required for construction and operation of mining infrastructure.
• Coordination and integration of geotechnical, hydraulic, civil and construction disciplines, evaluating alternatives, constructability, technical risks and operational performance of proposed solutions.

Senior Advisor - Tailings, Water Management & Infrastructure Engineering at RIO BLANCO (2025-07 – 2025-12)

• Development and review of engineering for tailings storage facilities and associated mining infrastructure.
• Evaluation of facility siting and configuration alternatives, considering geotechnical, hydraulic, construction, environmental and operational aspects.
• Technical review of the comprehensive Water Management Study prepared by the project's specialist water-management consultant for Rio Blanco, a high-precipitation mining project with approximately 3,000 mm/year annual rainfall.
• Review of the integrated site water balance, surface runoff, contact and non-contact water segregation, diversion systems, drainage, water-storage requirements and operational water-management strategy.
• Development of criteria for water management, drainage, access roads and auxiliary works as part of the project engineering.
• Evaluation of water-management criteria associated with TSF and infrastructure alternatives, considering extreme rainfall, constructability, operational reliability and environmental risk.
• Technical coordination and review of hydraulic, geotechnical and civil interfaces associated with the project water-management system, aimed at optimizing constructability, safety and operational performance.

TSF Superintendent - Tailings Engineering & Projects at KINROSS - LA COIPA (2024-10 – 2025-04)

• Engineering and optimization of the mechanized filtered-tailings placement system (Dry Stack Radial - FAM), integrating mechanical, geotechnical and operational requirements of the mobile stacker, conveyor and deposition system.
• Evaluation and adjustment of engineering and operating parameters of the mobile stacking system, including deposition sequence and geometry, positioning and rotational relocation of the stacker on nine crawler tracks, three-axis conveyor alignment and optimization of tripper speed.
• Optimization of the facility construction sequence: integration of stacking-system capacity with deposition and compaction lift thicknesses, achieving controlled deposition layers of approximately 60 cm and effective compaction to 50 cm; equipment availability improved from approximately 75% to 95%.
• Engineering-Construction-Operations integration: coordination of geotechnical, mechanical and operational requirements of the FAM system with dry-stack construction requirements, identifying constraints and improvement opportunities to increase availability, reliability and capacity utilization.
• Geotechnical and construction performance monitoring through InSAR, operational data and geotechnical instrumentation to verify facility performance and support engineering decisions.

Senior Tailings Management Facility Engineer at QUEBRADA BLANCA 2 - TECK (2022-07 – 2024-10)

• Technical management and monitoring of TSF development, coordinating engineering and construction activities with the Engineer of Record (EoR), Operations, Planning, contractors and specialized consultants.
• Engineering review and monitoring of dam raises, earthworks, drainage, seepage-control systems, water-management systems and associated infrastructure.
• Planning and control of operational capacity, freeboard, tailings beach development and deposition sequencing.
• Evaluation of alternatives and optimization of sand systems, seepage management and water recovery/reclaim-water management.
• Operation and technical coordination of water-recovery systems, including two pump barges with three pumps each, associated pipelines and the 12.5 km hydraulic channel.
• Evaluation of water-chemistry and pipeline-integrity issues, including high electrical conductivity (~5,000 uS/cm), pH ~5, corrosion risk, internal coating replacement and corrosion-monitoring systems.
• Cold-weather engineering and construction controls under -10 to -15 C conditions, optimizing placement-layer thickness and fines content to maintain hydraulic and geotechnical performance.
• Integration of engineering, construction, survey, geotechnical instrumentation, InSAR, radar monitoring and operational information to support technical decision-making and risk management.
• Multidisciplinary coordination with Engineering, Construction, Operations, Planning and contractors.

Engineering Supervisor - TSF & Water Management at EMINCAR - TRAFIGURA (2020 – 2021)

• Participation in the engineering and Stage 2 raise of the rockfill TSF, integrating geotechnical, hydraulic and construction requirements.
• Engineering and operational management of the site water balance under tropical high-rainfall conditions of approximately 3,000 mm/year.
• Management of contact and non-contact water, including runoff diversion, drainage, pond management, recirculation and water-recovery systems associated with the TSF.
• Bathymetric assessment and water-storage management for approximately 1.0 million m3 of accumulated water during high-rainfall conditions; optimization of recirculation to reduce stored-water volumes and maintain operational freeboard.
• Technical evaluation and implementation of surface-water and drainage measures to support Stage 2 construction and safe TSF operation under extreme rainfall conditions.
• Participation in acid rock drainage (ARD) mitigation using cement/lime slurry and additive treatment, integrating environmental, water-quality and operational requirements.
• Construction monitoring, including earthworks, instrumentation and QA/QC, verifying compliance with design criteria and technical specifications; technical coordination of field activities and resolution of technical requirements during construction.

Superintendent - Engineering, Construction, Commissioning & Start-up at TOROMOCHO - CHINALCO (2012-11 – 2017-04)

• Management and supervision of multidisciplinary engineering, construction, commissioning and start-up of major mining infrastructure, coordinating Engineering, Construction, Operations, Maintenance, EPCM, contractors and specialized consultants.
• Supervision of civil works and mass earthworks for construction of the Starter Dam, including foundation preparation, construction sequencing, material placement and control, QA/QC and geotechnical instrumentation. The dam reached approximately 98 m in height, with more than 5.6 million m3 of material placed.
• CFRD/rockfill construction and materials control, including quality control of 4 MPa concrete curb and compliance with design criteria and technical specifications; experience with approximate dam slopes of 1.4H:1V upstream and 1.5H:1V downstream.
• Development and management of the project water balance for Toromocho, located in a high-altitude environment with approximately 1,700 mm/year annual precipitation, integrating process-water demands, runoff, reclaim water, drainage, seepage and operational water requirements.
• Engineering and implementation of the non-contact water-management system, including diversion channels, runoff-control structures, drainage infrastructure and segregation of contact and non-contact water.
• Engineering coordination, construction and commissioning of the Central Drain and associated drainage infrastructure for collection, conveyance and control of seepage and subsurface water.
• Supervision of construction of the approximately 2.5 million m3 geomembrane-lined Reclaim Pond, including earthworks, site preparation and interfaces with pumping, water recovery and return-water systems.
• Participation in engineering development with AMEC and supervision of grouting works for seepage control at the secondary dam, reducing seepage from approximately 100 L/s to less than 5 L/s.
• Supervision of construction of the upstream cofferdam with approximately 1.0 million m3 capacity and coordination of temporary pumping, diversion and water-management systems to control runoff and enable Starter Dam foundation construction.
• Engineering review and technical support for installation, commissioning and start-up of four 43 m thickeners and two GEHO pumping trains (five pumps per train, approximately 3,500 HP each), including piping, hydraulic systems, water recovery and auxiliary plant systems.
• Supervision of engineering and installation of barges, pumping systems, water recovery and conveyance systems to the concentrator plant, piping and associated infrastructure; participation in auxiliary systems, including mill cooling systems.
• Technical management of EPCM contractors and stakeholders, including scope, CAPEX, physical progress, schedules, resources, quality, safety, interfaces, technical deviations, engineering changes and construction milestones.
• Engineering review focused on constructability, operability, safety and execution sequencing, coordinating technical solutions and field support through commissioning, operational stabilization and handover to Operations.

Operations, Engineering, Construction & Start-up - TSF / Water Systems / PETAR at CERRO VERDE - FREEPORT-McMoRan (2006-06 – 2012-10)

• Direct participation in commissioning, start-up and operational stabilization associated with the Cerro Verde expansion and 180 ktpd TSF system.
• Development and optimization of cycloned-sand systems, internal drainage, dam construction and water-management infrastructure.
• Operation and technical coordination of fresh/mix water systems, reclaim water, pump barges, booster stations, pipelines and monitoring wells.
• Monitoring of staged construction, earthworks and QA/QC, verifying compliance with geotechnical criteria and technical specifications.
• Coordination among Operations, Engineering and Construction to resolve deviations and optimize tailings, water-system and infrastructure performance.
• Operational and technical management of tailings, water systems and associated infrastructure.

Concentrator Plant Commissioning, Start-up & Optimization at MINAS BUENAVENTURA (2001-04 – 2006-04)

• Direct participation in commissioning, start-up and optimization of the gold/silver concentrator plant, including process-water, recovery and tailings-management systems.
• Optimization of metallurgical performance, increasing gold recovery to approximately 95% and improving milling performance from P80 ~120 um to ~95 um.
• Implementation and operation of cyanide-destruction improvements, reducing free cyanide in tailings to below 1 ppm and strengthening environmental/water-quality performance.
• Technical support for installation and commissioning of the ILR, 9 ft x 13.5 ft ball mill, cyclone clusters, pumps and associated process/piping systems.
• Coordination with Maintenance, Process and Operations teams during commissioning, start-up, troubleshooting and plant stabilization; identification and resolution of technical requirements to achieve stable operating conditions.

Chemical Engineer

Master's Degree in Environmental Management - Specialization in Water Resources Management

Second Specialty in Geotechnical Engineering - Specialization in Slope Erosion

MBA in Business Administration – USIL, Miami, USA