Mine Tailings Dust Management Best Practice at New Gold s New Afton Mine
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1 Mine Tailings Dust Management Best Practice at New Gold s New Afton Mine C. Johns, R. Hoos, C. Sekhon, and D. Kelly, Tetra Tech S. Davidson, New Gold
2 Outline Importance of Tailings Facility Dust Control Particle Transport by Wind New Afton Mine Setting Dust Control Field Trials Dust Management at New Afton Mine
3 Importance of TSF Dust Control Health and Safety Reputation Stakeholder Relationships Environment
4 Importance of TSF Dust Control
5 Particle Transport by Wind Modes of Particle Transport by Wind (after Ciccone et al, 1986) Transport Mode Mode Description Particle Diameter Range (micrometers) Particle Description Surface Creep Saltation Suspension Particles too large to be dislodged into the airstream Dislodged particles rise and fall back to the surface Dislodged particles carried by turbulent wind action Medium sand Fine to medium sand <100 Fine sand, silt, and clay
6 Particle Transport by Wind Factors Affecting Dust Generation Particle size distribution Surface characteristics (slope length, angle) Meteorological variables (wind velocity, rainfall) Surface shear strength
7 Particle Transport by Wind Wind Erosion of Tailings Dams (Blight, 2007) Maximum erosion at upwind, steeper and higher slopes. Very little erosion from slopes near horizontal. Wind Erosion Erosion Tailings
8 New Afton Mine Setting
9 New Afton Mine Setting Processing Plant Open Pit Tailings Facility
10 New Afton Mine Setting Wind Roses for Hourly Average Conditions Shapes/Color Direction FROM Proportion Wind Speed Predominant WNW and ENE Secondary SE Seasonal Variability Limited
11 New Afton Mine Setting One-Minute Wind Speed and Direction Gusts can better indicate dust generation Highest from the SW and WNW (Red)
12 Fine tails Cyclone sand tails
13 New Afton Mine Setting Medium-Fine Cyclone Sand, 5-9% Fines.
14 New Afton Dust Control Trials Trial Area Three Slope Plots: A, B, C Three Crest Plots: B, C, D Acrylic Polymer and Pine Pitch Emulsion 100 m x 30 m July - August 2015 West Facing Slope No Construction Planned
15 New Afton Dust Control Trials Slope Application: Trailer-Mounted Hydroseeder (Two people) Post Application Dark Area
16 New Afton Dust Control Trials DustTrak Aerosol Monitor Crest Application: Truck-Mounted Hydroseeder (Two People)
17 New Afton Dust Control Trials Trial Monitoring Product B: Low Concentration Product A: High Concentration Initial: Volume of product/water used Equipment and Manpower Trial Period: Four weekly visits. Recorded observations: - Surface finish - Dust suppression - Deterioration
18 New Afton Dust Control Trials Trial Interpretation Compile Observations Cost Comparison: - Product Supply - Surface Preparation - Application Product B: Road Application Crust Interpret results
19 New Afton Dust Control Trials Summary of Dust Trial Program Results Product Performance Ease of Application Cost A 5/5 5/5 5/5 B 4/5 5/5 4/5 C 3/5 3/5 3/5 D* 4/5 5/5 N/A *Crest traffic area, not slope ALL products produced beneficial effect Some more robust,user friendly Cost varied C$0.27/m 2 C$1.77/m 2 Road surface application specialty product
20 New Afton TSF Dust Mitigation Plan Trials helped selection of method and materials to reduce dust and meet operational needs Optimize concentration/application frequency Other Elements to Dust Mitigation Plan: Traffic management Construction controls/sequencing Response to observations/complaints
21 Thank you Acknowledgements Travis Miguez Scott Davidson
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