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8/3/2019 Introduction to Tailings Management
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Introduction to Tailings ManagementMarch 15, 2011
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Components of a Mine
Tailings
ImpoundmentMill or
Processing Plant
Access Roads
Process Ponds &Water Supply
Open Pits &
UndergroundWorkings
Waste Rock
Dumps
Reclamation
Soil Stockpiles
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What are Tailings?
Waste product from ore
grinding & mineral extraction
Rock ground to sand and siltsizes to maximize liberation of
metals in extraction processes
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What are Tailings?
Two ore more stages of crushing typical
Primary crushing to 12 mm
Fine grinding circuits
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Function of Tailings Impoundments
Operations:
Safe storage of tailings solids &
process water Sedimentation & clarification
of water for reclaim to process
plant Store & attenuate floods at
mine site
Mitigate Acid Rock Potential
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Function of Tailings Impoundments
Closure:
Safe storage of tailings solids &
water Polish water for release to
environment
Reclaimed to meet post-closure land uses
Mitigate Acid Rock Potential
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Challenges
Tailings dams are now
largest dams in the world
Focus of intense
environmental scrutiny
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Tailings Management Studies
Main Components
Site characterization
Climate
Hydrology studies
Geotechnical & geology studies
Hydrogeology studies
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Tailings Management Studies
Main Components
Tailings characterization
Geotechnical properties
Geochemical properties
Technologies assessment
Thickened tailings
Paste tailingsFiltered tailings
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Tailings Management Studies
Main Components
Design criteria
Factors of safety
Seismic design parametersDesign flood events
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Tailings Management Studies
Main Components
Engineering Design
Tailings staging plan
Dam structuresWater balance
Surface water management plan
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Tailings Management Studies
Main Components
Risk Assessment
Continuous evaluation of
environmental risks at eachproject development stage
Enables tracking of risk
mitigation throughout design
process
Failure Modes and Effects
Analysis (FMEA) technique
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Tailings Management Studies
Main Components
Environmental Management Plans
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Tailings Management Studies
Main Components
Closure Plans
Meet long-term land uses
(agriculture, industrial, etc.)Stable against landslides and
seismic loading
erosion
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Tailings Management Studies
Main Components
Quantities & cost estimate
Initial Capital costs
Sustaining Capital costsOperating costs
Closure costs
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Process of Design Studies
ConceptualPreliminary Economic
Assessment (PEA)
Pre-Feasibility
Feasibility
Initial project financialassessment (go/no go)
Bankable feasibility costestimates
Permitting support document
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Project Timelines
Exploration
Preliminary Economic Assessment Pre-Feasibility Feasibility
-30 t = 0 yr 2 3 4
Conceptual
Engineering Pre-Feasibility Feasibility
Engineering Studies
Baseline Studies EIA
Environmental Studies
3+ mths 6+ mths 12+ mths
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Preguntas?