Mark Hawley, Piteau Associates Engineering Ltd. John Cunning, Golder Associates Ltd.
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1 Introducing: GUIDELINES FOR MINE WASTE DUMP AND STOCKPILE DESIGN Editors: Mark Hawley, Piteau Associates Engineering Ltd. John Cunning, Golder Associates Ltd. 8 November 2017
2 Sponsorship 8 November
3 LOP Sponsors At time of initiating the Waste Dump Book 8 November
4 LOP Sponsored Books Guidelines for Open Pit Slope Design (Eds. Read and Stacey 2009) Guidelines for Evaluating Water in Pit Slope Stability (Eds. Beale and Read 2013) Guidelines for Mine Waste Dump and Stockpile Design (Eds. Hawley and Cunning 2017) Guidelines for Design of Open Pit Mines in Weak Rocks (Eds. Martin and Stacey) to be published in November
5 Why do we need a book on Guidelines for Waste Dumps, Stockpiles and Draglines Spoil Design? 8 November
6 Why do we need a book on Guidelines for Waste Dumps, Stockpiles and Draglines Spoil Design? 8 November
7 Some Good Examples 8 November
8 Some Good Examples 8 November
9 Some Good Examples 8 November
10 Some Good Examples Dragline Spoils 8 November
11 Some Not So Good Examples 11 8 November 2017
12 Some No So Good Examples 8 November m 12
13 Mine Waste Dump Guidelines Previous Guidelines for mine waste dump design were prepared following disasters in UK (1970 s), USA (1975), Canada (Canmet 1977), and BC (BCMWRPRC 1990 s) The Large Open Pit project undertook Guidelines for pit slopes design and evaluating water in pit slopes, with a logical next step to be a Guideline on the mine waste dumps. At LOP request this included stockpiles and draglines spoils 8 November
14 The Guidelines Book Outline A comprehensive and practical guide to the investigation, design, operation, monitoring, and closure of mine waste dumps, dragline spoils, and major stockpiles. 8 November
15 The Guidelines Book Outline Appendix I Summary of British Columbia Mine Waste Dump Incidents November
16 The Guidelines Book Outline Appendix II Summary of the 2013 Mine Waste Dump Survey 8 November
17 Chapter 2: Basic Design Considerations Mark Hawley Overview of design considerations and processes by stage of design for Waste Dumps and Stockpiles Key Site Selection Factors: Regulatory and social Mining Terrain and geology Environmental Geotechnical Fill material quality Closure Objectives by Project Stage INITIAL SITE SELECTION CONCEPTUAL DESIGN PREFEASIBILITY DESIGN FEASIBILITY DESIGN DETAILED DESIGN & CONSTRUCTION OPERATION CLOSURE 8 November
18 Chapter 2: Basic Design Considerations Mark Hawley Study Requirements (Level of Effort ) described by stage of design 18
19 Chapter 3: Waste Dump and Stockpile Stability Rating and Hazard Classification - Mark Hawley Introduction of new stability rating and classification system (WSRHC) 22 factors organized into 7 groups Large number of factors, but most are intuitive and easily obtained Boils down to 2 indices: Engineering Geology Index (EGI) Design and Performance Index (DPI) Spreadsheet version available 19
20 Chapter 3: Waste Dump and Stockpile Stability Rating and Hazard Classification - Mark Hawley Stability Rating (WSR) 1 to Hazard Classes (WHC) Low dump, over flat ground High dump in mountainous terrain 20
21 Chapter 3: Waste Dump and Stockpile Stability Rating and Hazard Classification - Mark Hawley 21
22 Chapter 4: Site Characterisation Michael Etezad, John Cunning, James Hogarth and Geoff Beale Level of effort discussed as function of stage of project and level of risk Site Characterisation Study Areas: Physiography and geomorphology Geology Natural hazards Climate Geotechnical Planning and Methods for Field Investigations Drilling and in situ testing methods Sampling 22
23 Chapter 5: Material Characterisation Leonardo Dorador, John Cunning, Fernando Junqueira and Mark Hawley Foundation Material Properties Soils Index properties and classification In situ density Shear strength Hydraulic conductivity Bedrock Rock/rock mass characterisation and classification Intact rock and discontinuity strength Rock mass strength 23
24 Chapter 5: Material Characterisation Leonardo Dorador, John Cunning, Fernando Junqueira and Mark Hawley Waste Dump Material Properties Rockfill Index properties and classification Geochemistry Non linear Shear strength functions based on large triaxial testing results
25 Chapter 6: Surface Water and Groundwater Characterisation -Geoff Beale Planning Surface Water and Groundwater Investigations Development of a Conceptual Hydrogeological Model
26 Chapter 6: Surface Water and Groundwater Characterisation -Geoff Beale Hydrogeological Modeling of the Dump/Stockpile and Foundations Water balance, quantity and quality Pore pressure modelling 26
27 Chapter 7: Diversions and Rock Drains James Hogarth, Andy Haynes and John Cunning Diversion Channels Rock Drains Based on original CANMET Rock Drain Research Program ( ) Other drainage elements Drainage Blankets French Drains Chimney Drains Toe Drains 27
28 Chapter 8: Stability Analysis Mark Hawley, James Hogarth, John Cunning, Andy Haynes Factors Affecting Stability Suggested Acceptance Criteria 28
29 Chapter 8: Stability Analysis Mark Hawley, James Hogarth, John Cunning, Andy Haynes Application of Acceptance Criteria 29
30 Chapter 8: Stability Analysis Mark Hawley, James Hogarth, John Cunning, Andy Haynes Failure Modes Waste materials, foundations and liquefaction Analysis Techniques Methods of static limit equilibrium Probability of failure Seismic/pseudo static analysis Numerical methods 30
31 Chapter 9: Runout Analysis Oldrich Hungr Evaluation of the consequence of a mine waste dump failure by considering the potential distance that runout debris may travel should failure of the dump occur
32 Chapter 9: Runout Analysis Oldrich Hungr Material Properties for runout Slide initiation Dynamic Runout Analysis and Prediction (2 and 3D) Protection Measures Example Analysis 32
33 Chapter 10: Risk Assessment Brian Griffin Risk Assessment Processes applicable to Mine Waste Dumps Risk Management Process Analysis, Mitigation and Management 33
34 Chapter 11: Operations Andy Haynes and Geoff Beale Dump and Stockpile Management Plans Foundation Preparation Water Management Material Management Concurrent reclamation Crest Advance Rate Guidelines
35 Chapter 12: Instrumentation and Monitoring James Hogarth, Mark Hawley and Geoff Beale Visual inspections Displacement monitoring Monitoring Guidelines Surface water and groundwater monitoring 35
36 Chapter 12: Instrumentation and Monitoring James Hogarth, Mark Hawley and Geoff Beale Monitoring and inspection guidelines linked to Hazard Class (WHC)
37 Chapter 12: Instrumentation and Monitoring James Hogarth, Mark Hawley and Geoff Beale Example of TARPS (response framework), linked to Waste Dump and Stockpile Hazard Class
38 Chapter 13: Dragline Spoils John Simmons and Robert Yarkosky Operational Characteristics
39 Chapter 13: Dragline Spoils John Simmons and Robert Yarkosky Dragline Operating methods Instability mechanisms
40 Chapter 13: Dragline Spoils John Simmons and Robert Yarkosky Inputs to stability analysis What can go wrong Methods for stability analysis
41 Chapter 13: Dragline Spoils John Simmons and Robert Yarkosky Stability analysis techniques
42 Chapter 14: Management of ARD Ward Wilson Principles of Acid Rock Drainage (ARD) and Metal Leaching (ML) Drivers of ARD Geochemical weathering processes Climate Dump structure and hydrology Oxygen and water transport Review of Prevention and Control Segregation Blending Encapsulation Barriers and seals Subaqueous disposal Air Advection Oxygen Diffusion Hot Air Coarse Rock Chimneys Advective Pathways Dominate Oxygen Entry Upward Advection of Air by Exothermic Oxidation Reactions Hot Air Oxygen Diffusion Interbedded Coarse and Fine Waste Rubble Zone
43 Chapter 15: Emerging Technologies Ward Wilson Co disposal techniques Waste rock in tailings Tailings in waste rock Layered co mingling; cells Paste rock and mixtures of waste rock and tailings Blending Progressive sealing Waste Rock Cells Cells filled with Thickened Tailings
44 Chapter 16: Closure and Reclamation Björn Weeks and Eduardo Salfate Approach to Closure and Reclamation Planning Closure criteria Design life Water quality Geotechnical Surface water management Geochemical stability Physical stability Erosion Revegetation 44
45 Guidelines Book Team Edited by Mark Hawley and John Cunning with the assistance of an editorial subcommittee: Geoff Beale (Schlumberger Water Services), James Hogarth (Piteau Associates Engineering Ltd), Andy Haynes (Golder Associates Ltd), Peter Stacey (Stacey Mining Geotechnical Ltd), Stuart Anderson (Teck Resources Ltd) and Claire Fossey (Golder Associates Ltd). Supported by Geotechnical Consultants: Schlumberger Water Services, Sherwood Geotechnical and Research Services, John Simmons Dr Oldrich Hungr and Dr Ward Wilson. CSIRO Publishing 8 November
46 In Closing The Guidelines for Mine Waste Dump and Stockpile Design book is now published and available for use Staff from mining industry sponsor sites have received the book and are starting to use it We encourage and look forward to mine waste dump papers at Tailings and Mine Waste and at other conferences 8 November
47 QUESTIONS? Images from Hawley and Cunning (2017) are copyright CSIRO (2017) 47 8 November 2017
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