Rehabilitation of Historic Mine Workings

Course Objectives
 

This course aims to walk participants through the process of investigating, mitigating, and rehabilitating hazards associated with abandoned, orphaned or historic mines.  With these old mine workings the typical issues are around unmitigated hazards that can present themselves in two ways – gradually or as sudden event. These hazards can include open mine voids on surface, land subsidence, sinkholes, etc. The problems associated with these sites can be complex and difficult to manage from a technical, environmental and especially economic perspective.  The mechanisms of surface impacts can be difficult to understand, making assessment of hazards and suitable mitigation or remediation efforts to limit risk complex. In some cases, there is considerable uncertainty around the accuracy/availability of the geometry of the mine workings and the geology. Challenges such as historical mine plans along with physical constraints like limited safe underground access, access for equipment and logistics, and proximity to local communities with the overarching umbrella of potential adverse environmental impacts are common control, and the application of these concepts to the design and implementation of effective thickening systems.


Presenters

The course is presented by Sue Longo, Jonathon Taylor, Darren Kennard and John Scholte - Golder Associates Ltd., Canada.


Click on the link below for a complete Course Outline:

Rehabilitation of Historic Mine Workings

 

 

 


A Step by Step Guide to Risk Informed Decision Making for Mining Projects and Operations

​Course Objectives 

 

This will be a hands-on exercise. We will use the Balangero Asbestos Mine Dumps Environmental Rehabilitation as a basis. That project, a competitive bid, was won by an engineering group supported by what was then called Risk Based Decision Making (RBDM). Thus it was demonstrated that including risk assessment through the design of a project, from cradle to delivery and including risk driven maintenance concepts brought value and a leading edge to the proponents.

Together we will work through all the phases of the approach (based on the ORE methodology -Optimum Risk Estimates- ©Oboni Riskope Associates Inc.), including:

  • System definition
  • Success/failure criteria. Objectives Hierarchy, constrained objectives.
  • Alternatives generation
  • Delivered data
  • Needed data. Data to be acquired/evaluated
  • What methods to use for probabilistic estimates?
  • Hazards and multi-dimensional consequences analyses
  • Risks
  • Risk tolerances
  • Dashboards
  • Recommendations and Condition of validity.
  • Decision-making (alternative selection, mitigation, resilience enhancements, etc.)
  • Actions (includes communication)
  • Back to the start: monitoring, new data, etc.

 

Presenters

This course is presented by: Franco Oboni and Cesar Oboni - Oboni Riskope Associates Inc., Vancouver, B.C.

  

Click on the link below for a complete Course Outline:

A step by step guide to Risk Informed Decision Making


Terrain Analysis Short Course

Course Objectives
 

The course will be split into three segments.  The first segment will discuss the importance of terrain data and analysis for mine planning.  The second segment will focus on surficial material / soil types, their classification and general properties as related to mining.  The third and most important segment will deal with how we develop and collect this data with particular focus on the interpretation of stereo aerial photographs and LiDAR data.  Participants will view traditional stereo imagery captured at 1:30,000 scale at scales of 1:1,000 to 1:500 with the aid of 3D glasses and computer software known as softcopy and will learn some of the keys in airphoto interpretation for terrain sciences.

 

Presenters

The course is presented by Dennis O'Leary and Dr. Anne Sommerville - Golder Associates Ltd., Canada.


Click on the link below for a complete Course Outline:

Terrain Analysis Short course

Cover Design and Construction for Tailings, Waste Rock, and Heap Leach Pad Closure

​Course Objectives 

 

This course will deal with the general principles and practice of covers—what their purpose is, what objectives govern their selection and detailing, and what to consider when choosing a cover for your specific facility. 

 

The course includes numerous case studies from the author's extensive experience. It also includes descriptions of many types of covers that have been used and that could be used at mines. 

We will examine the:

  • objectives of mine closure—the activity that most frequently gives rise to the need for a cover;
  • purpose of the cover, and hence the criteria which govern the design, construction, and ultimately the performance of the cover; and
  • layers or components of a cover—some to limit infiltration, some to resist erosion, and some to support vegetation.
  • the design and performance assessment of covers;
  • engineering, scientific, and technical design methods to calculate and quantify just how the cover may perform in regards to stability, infiltration, erosion, and deformation; and
  • the construction, surveillance, and monitoring that will need to be undertaken to put and keep the cover in operation.


 

Presenters

 

This course is presented by: Jack Caldwell- Robertson Geoconsultants., Vancouver, B.C.

  

Click on the link below for a complete Course Outline:

 

Heap Leach Pad Closure

Chemical Compatibility and Slope Stability of Polymer-Modified Geosynthetic Clay Liners

 PLEASE NOTE THIS SHORT COURSE HAS BEEN CANCELLED

 

Course Objectives
 

This short course will describe how polymer-modified GCLs function in comparison to traditional GCLs, and appropriate testing and design approaches. The focus is on mining and mine waste containment applications, but the principles apply to other industries and applications as well. The newest methods to evaluate chemical compatibility of polymer modified geosynthetic liners with site-specific leachates will be discussed, including new testing provisions currently being considered for standardization by ASTM. Procedures for evaluating internal shear strength and interface shear strength will be evaluated with special provisions for polymer-modified GCLs.


The importance of polymer loading and polymer uniformity will be discussed, and methods to evaluate loading will be described.

 

Participants who complete this course will have a fundamental understanding regarding the principles on which polymer-modified GCLs function, appropriate testing methods, and principles for design and quality assurance. Participants who complete the course will receive 4 professional development hours (PDH).


Presenters

 

The course is presented by Craig Benson (Dean and Hamilton Endowed Chair, School of Engineering, University of Virginia) and Patrick Fox (Department Head and Shaw Endowed Professor, Civil & Environmental Engineering, Pennsylvania State University)


    Click on the link below for a complete Course Outline:

    Chemical Compatibility and Slope Stability

    Tailings Dam Failure, Hazard Evaluation and Tailings Dam Safety Practices

    Course Objectives
     

    Public concern over safety of tailings dam facilities is growing as recent tailings dam failures in British Columbia (Canada), in 2014, Buenavista del Cobre, Sonora (Mexico) in 2014 and Bento Rodrigues (Brazil) in 2015, have resulted a significant impact to people and the environment. Breaching of tailing dams often results in the sudden release of water and sediments (tailings). Global record of historical events shows that consequences following these failures have been significant and in some instances catastrophic. Consequences of historical events included loss of life, changes in fluvial geomorphology and slope stability, and widespread contamination resulting in loss of terrestrial and aquatic habitat. This workshop is intended to provide an overview of tailings dam design, operation and causes of catastrophic failure and to discuss current methods and associated challenges for downstream hazard and consequence assessment. The workshop will also provide an update on the current state of tailings dam safety practice, proposed changes by regulators and professional organizations in Canada in light of the recent dam failures. The workshop will be delivered by the following three sessions:


    Session I: Tailings Dam Failure Tailings dam design and operation has some fundamental differences compared to typical water dams. A brief discussion on the tailings dam types, challenges for construction and operations that could lead to the catastrophic failure will be elaborated with a number case histories.


    Session II: Tailings Dam Failure Hazard Assessment Unlike water dams, tailings dam contains a variety of materials from tailings operations that includes water, fluid tailings and solid tailings. A dam failure can release any or all of these materials and can take the form of an outburst flood, debris flow or a combination of both. The extent of damage to the downstream environment will depend on the concentration and volume of the flow among many other parameters and difficult to estimate. A brief overview of current practice of tailings dam failure hazard assessment and gap will be provided with relevant case histories.


    Session III: Dam Safety Practices Since Mount tailings dam failure (2014) a numerous efforts were undertaken by the regulators in British Columbia and the professional organizations like CDA, MAC etc. to review and enhance the current state of dam safety practice. These proposed changes are aimed at improving dam safety management system and current design practice. In this part of the workshop the proposed changes will be discussed in details.


    Presenters

     

    The course is presented by: Mr. D. Chad LePoudre, P.Eng., Mr. Mohammad Al-Mamun from SNC Lavali and  Ms. Vanessa Cuervo, currently a Ph.D. student at University of Waterloo.

      Click on the link below for a complete Course Outline and Author Bios:

       

      Tailings Dam Failure Workshop_Outline and Bios

       


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