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Presentation to the Portfolio Committee: Water& Environment. I mpact of Current Rainfall / Flooding on Acid Mine Drainage in Gauteng. Presentation by Mr N Nepfumbada Acting Deputy Director-General: Policy & Regulation 26 - 27 January 2011.

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presentation to the portfolio committee water environment

Presentation to the Portfolio Committee: Water& Environment

Impact of Current Rainfall / Flooding on Acid Mine Drainage in Gauteng

Presentation byMr N NepfumbadaActing Deputy Director-General: Policy & Regulation

26 - 27 January 2011

slide2

High rainfall / flooding leads to increased ingress of water into mine workings via:

        • Surface streams
        • Shallow groundwater systems
        • Open pit mining

Leads to increased mine water levels and decant of AMD

2

slide3

Status of Western Basin (West Rand)

  • Dry season: zero AMD decant or relatively small volume (2 ML / day) + {12.5 ML / day partially-treated mine water}
  • Wet season: AMD decant of 15.5 ML / day (Dec 2010) up to 30 ML / day (as at Jan 2011) + {12.5 ML / day partially-treated mine water}
  • Impacts on Tweelopies Spruit flowing to the Crocodile River system. Recent fish kills not due to AMD.

3

slide4

Status of Central Basin (Central Jhb)

  • Dry season: mine water rises by 0.3 m / day
  • Wet season: mine water rises by 0.9 m / day
    • Current rate of rise is 0.37 – 0.47 m / day
    • Despite high rainfall, the rate of rise is less pronounced due to delayed ingress or greater void volume at 500 m below surface level (lateral spreading of water)

4

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Status of Eastern Basin (East Rand)

  • Recent rainfall has increased rate of mine water rise to 0.4 m / day (7 x increase)
  • Pump station can flood within 16 days at this rate
  • Grootvlei Mine has reported urgent measures underway to increase pumping capacity

5

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Recommendations

  • As per Expert Team report to the Inter-Ministerial Committee on Acid Mine Drainage, interventions include:
  • Western Basin: reduce ingress by pit filling and canalising watercourses
  • Central Basin: ingress reduction by canalising streams over mining areas + grouting (sealing) of mine paths
  • Eastern Basin: immediately expand culvert in Blesbok Spruit to reduce water entering mine
  • The above recommendations have been included in a Cabinet Memorandum which will be processed shortly

6

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The End

Thank you

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