TD 'Lubenge' - Konkola (KCM Vedanta) - Zambian Copperbelt (sitios de interés)
Descripción del sitio
3.3.3 Tailings Disposal
The Konkola Tailings were and still are disposed of at the Lubengele Tailings dam, situated approximately 4 km north of the process plant. The tailings facility was constructed in 1964 in a natural valley into which 4 streams flow.
In August 2005 the tailings generated within the plant were piped to the tailings dam through one of two pipes which operate alternately. The dam consisted of two separate ponds within the dam area through which the water passed until coming to the surface decant point where the water was discharged via a penstock into the Lubengele Stream, which ultimately joins the Kafue River. Drainage from the embankment was collected by filter drains. A spillway was due to be constructed to accommodate emergency runoff.
Erosion of the wall was occurring due to the angle of the dam wall. The erosion gullies that formed were backfilled every two years with course tailings or rockfill. In order to prevent erosion from occurring, vegetation of the walls was being undertaken
3.4.4 Tailings Disposal
At 6 Mtpa the capacity of the Lubengele dam provides in excess of eighty days residence time. This is more than sufficient for natural settlement of the fine material in the increased volumes of waste water to be discharged from the expanded process plant.
However, the wall of the dam has to be raised by approximately 10 metres to provide the necessary capacity for tailings discharge up to 2031 and the existing penstock will be replaced with a spillway. The wall design is based on a 1 in 100 year, 24 hour floodline.
IMC Group Consulting Ltd (January 2008)
The Konkola Tailings were and still are disposed of at the Lubengele Tailings dam, situated approximately 4 km north of the process plant. The tailings facility was constructed in 1964 in a natural valley into which 4 streams flow.
In August 2005 the tailings generated within the plant were piped to the tailings dam through one of two pipes which operate alternately. The dam consisted of two separate ponds within the dam area through which the water passed until coming to the surface decant point where the water was discharged via a penstock into the Lubengele Stream, which ultimately joins the Kafue River. Drainage from the embankment was collected by filter drains. A spillway was due to be constructed to accommodate emergency runoff.
Erosion of the wall was occurring due to the angle of the dam wall. The erosion gullies that formed were backfilled every two years with course tailings or rockfill. In order to prevent erosion from occurring, vegetation of the walls was being undertaken
3.4.4 Tailings Disposal
At 6 Mtpa the capacity of the Lubengele dam provides in excess of eighty days residence time. This is more than sufficient for natural settlement of the fine material in the increased volumes of waste water to be discharged from the expanded process plant.
However, the wall of the dam has to be raised by approximately 10 metres to provide the necessary capacity for tailings discharge up to 2031 and the existing penstock will be replaced with a spillway. The wall design is based on a 1 in 100 year, 24 hour floodline.
IMC Group Consulting Ltd (January 2008)