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Environmental aspects of mineral processing tailings operation

Environmental aspects of mineral processing tailings operation. Group 10 Lecturer: Imre Gombkötő University of Miskolc - Hungary Students: Friedrich Jagnow Jonas Finke Stefan Lohberger. International Project Week Fh Nordhausen 30.4.2010. Project.

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Environmental aspects of mineral processing tailings operation

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  1. Environmental aspects of mineral processing tailings operation Group 10 Lecturer: Imre Gombkötő University of Miskolc - Hungary Students: Friedrich Jagnow Jonas Finke Stefan Lohberger International Project Week Fh Nordhausen 30.4.2010

  2. Project Imaginary mining facility: Case study A new explored ore field south of Goslar is to be exploited. Think about the handling and storage of tailings and its risks. 25.000.000 metric tonnes of ore 14% Zn, 6% Pb, 5% Cu, 1 g/t Au, 140 g/t Ag and 20% barite 500 to 900 meters deepth Nearby existing mining facilities pic. By Harz Minerals GmbH

  3. What are tailings • Tailings are a waste product of the ore processing. • Suspension of water and fine rock particles • Often contain dangerous chemicals and components like heavy metals, cyanideandacids • Risks depend on mineralogy, mining technology, mineralprocessingandthe method of deposition International Project Week Fh Nordhausen 30.4.2010

  4. Properties of Rock • barite content is useful • ARD: acid generating potential because of sulfidic mineral components especially pyrite • Heavy metal content is able to mobilise International Project Week Fh Nordhausen 30.4.2010

  5. How will it bemined out? Open pit Underground mining International Project Week Fh Nordhausen 30.4.2010

  6. How will itbeprocessed? International Project Week Fh Nordhausen 30.4.2010

  7. How will itbeprocessed? International Project Week Fh Nordhausen 30.4.2010

  8. How will it be processed? Partical size below 200 mikrometers Flocculant (polymers) Flotation agents such as:  organic collectors (xanthate), pH-regulators (sodium hydroxide, sulfidic acid) depressors (sodium cyanide)  frothers (alcohols) International Project Week Fh Nordhausen 30.4.2010

  9. How will it be deposited? International Project Week Fh Nordhausen 30.4.2010

  10. Quantity of waste Approximately 8 Mio m³ of solid waste Together with app 800,000 m³ water International Project Week Fh Nordhausen 30.4.2010

  11. Risks of open pit storage Contamination of groundwater through heavy metals, acidic water Toxic free Sodium Cyanide Damage to flora & fauna Risk of unexpected human activity International Project Week Fh Nordhausen 30.4.2010

  12. Risks of underground storage Contamination of groundwater and surface water through heavy metals and acidic water Toxic free Sodium Cyanide The possibility of insuficiant capacity of the cavities International Project Week Fh Nordhausen 30.4.2010

  13. Risks of conventional storage Similar risks like open pit method Additionally dusting dam failure due to erosion, overtopping or liquefaction of the dam caused by vibration (blasting) International Project Week Fh Nordhausen 30.4.2010

  14. Environmental aspects of mineral processing tailings operation Finish Group 10 Lecturer: Imre Gombkötő University of Miskolc Students: Friedrich Jagnow Jonas Finke Stefan Lohberger International Project Week Fh Nordhausen 30.4.2010

  15. References Google Earth imagery open pit mining: http://places.mongabay.com/australia/open_pit_mine.jpg underground mining: http://upload.wikimedia.org/wikipedia/commons/2/2d/Bergwerk-monopol-bergkamen.jpg jaw: http://www.limingjawcrusher.com/pic/jaw.jpg International Project Week Fh Nordhausen 30.4.2010

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