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      • Ravi Naidu
      • Michael Wright
      • Matthew Newton
      • Travis Peake
      • Ingrid Meek
      • Karin Fogarty
      • Rob Loch
      • Maria Eugenia Cola
      • Stephen White
      • Paul Storer
      • Chris Gimber
      • Robert Scanlon
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    • Past Conferences >
      • 2018 Mine Rehab Conference >
        • 2018 Presenters >
          • Will Mitry
          • José F. Martín Duque
          • Stephen Barry and Hamish Aiken
          • Stephen White
          • Nanthi Bolan
          • Eduardo Arellano
          • Jo-Anne Everingham
          • Yudi Firmanul Arifin
          • Thomas Baumgartl
          • Gede Widiada
          • Harley Lacy
        • 2018 Workshops >
          • José F. Martín Duque
          • Greg Hancock
          • Jo-Anne Everingham
      • 2017 Mine Rehab Conference >
        • Mine Rehab Registrations
        • 2017 Sponsors
        • Local Information for MLRC
        • Conference Program
        • 2017 Presenters >
          • Matthew Newton
          • Penny Dunstan
          • Travis Peake
          • Karin Fogarty
          • Ben Clibborn​​
          • Neil Griffiths
          • Shannon Mulholland
          • Howard Wildman
          • Nanthi Bolan
          • Laura Kuginis
          • Carmen Castor
          • Didik Triwibowo
          • Chris Gimber & Brad O'Reilly
          • Corinne Unger
          • Simit Raval
          • Greg Hancock
          • Grant Dickins
        • 2017 Panel Discussion >
          • Peter Elliott
          • Stephen Barry
          • Martin Rush​
          • Andrew Keith
          • Matthew Newton
          • Richard Bush
        • 2017 Poster Presenters >
          • Robert Scanlon
          • Angus Carnegie
          • Hannah Alcantara
          • Andrew Keith
          • Yilu Xu
          • Hasintha Wijesekara
          • Shannon Diener
          • John Ritchie
          • Charles Lee
          • Bikram Banerjee
          • Sonia Shilpi
        • 2017 Cocktail Dinner
        • 2017 Workshops >
          • Garry Willgoose
          • Peter Elliott
          • Donna Pershke
          • Simit Raval
          • Michael Hitch
          • Wendy Timms
        • 2017 Mine Tours
        • Information for Exhibitors
        • Delegate Handbook
        • Conference Feedback Survey
        • Mine Tour Feedback Survey
        • Sponsor and Exhibitor Feedback Survey
        • 2017 Mine Rehab Conference - original
      • 2016 Mined Land Conf
      • 2015 Mined Land Conf >
        • Conference Presenters
        • Poster Presentations
        • Supporters
      • 2014 Mined Land Conf
    • Research >
      • Soil quality monitoring
      • Coal Dissolution Testing
      • Health implications of coal dust in rainwater
      • Honey bees the new canaries for monitoring of mined-land rehabilitation
      • Geomorphic design and modelling at catchment scale for best mine rehabilitation
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​​Alex Watson

​SRK Consulting
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Alex is a principal consultant in SRK’s mine waste team based in Sydney, and has over 20 years’ experience in environmental projects.  He has worked on projects covering a range of resources including gold, copper, zinc, iron and coal, in various countries and climates across the world.  Alex specialises in geochemical characterisation and acid rock drainage prediction and control, metal leaching and water quality modelling.

​Abstract
Pit Lake Water Quality Modelling at Century Mine

The Century open cut zinc mine at Lawn Hill recently changed ownership from MMG Limited (MMG) to Century Mining Limited (CML).  Closure planning for the site was initiated by MMG, and is continuing under the new ownership.  The waste rock dumps will be covered with low infiltration covers to meet closure objectives.  However, the open pit which is partially backfilled with waste rock, is expected to fill with water post closure to form a pit lake.  As part of developing the site closure strategy, the final pit lake level (i.e. risk of discharge), and water quality that may develop within the lake post closure, were identified as potential risks to meeting downgradient water quality objectives.  To evaluate this risk, a pit lake model has been developed that integrates outputs from geochemical characterisation programmes, water balance studies and hydrogeological modelling.  The model quantifies solute production from pit walls and mineralised wastes located within the pit, and accounts for potential influence from out-of-pit waste dumps.  Pit lake water quality is calculated over time, allowing assessment of potential impacts to surface and groundwater, and third party receptors.  Using the predictions from the model it has been possible to compare potential environmental outcomes for different closure strategies and assumptions, thus allowing prioritisation of forward works and informed selection of optimal closure measures.
Conference Speakers
  • Ravi Naidu​
  • Michael Wright
  • Matthew Newton
  • Travis Peake
  • Ingrid Meek
  • Karin Fogarty
  • Rob Loch
  • Maria Eugenia Cola 
  • Stephen White
  • Paul Storer
  • Chris Gimber
  • Robert Scanlon
  • Clayton Richards
  • Alex Watson
  • Chris Waygood
  • Colin Schiller
  • Scott Sleap
  • Ihsan Noor
Workshop Convenors
​Wednesday:
Stream 1 - 
Pathways to relinquishment and opportunities to transition to productive alternate land uses
  • Donna Pershke​
Stream 2 - ​Understanding Acid Mine Drainage / Acid Rock Drainage and the implications for rehabilitation and closure
  • Gilles Tremblay
Stream 3 - ​Harnessing Hyperaccumulator Plants to Phytoremediate Contaminated Mining Sites
  • Charles Lee
  • Nanthi Bolan
Stream 4 - Issues in Tropical Forest Rehabilitation Post Mining
  • Tim Roberts
  • Yudi Firmanul Arifin
  • Ihsan Noor
  • Amalia Rezeki
​

Presentation

​Pit Lake Water Quality Modelling at Century Mine

​Presented on 20th June 2019 at the 9th Annual Best Practice Ecological Rehabilitation of Mined Lands Conference (2019)
alex_watson_pdf_version_of_the_presentation_for_your_website_century_9thmrc_for_presenting.pdf
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File Type: pdf
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