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PPC Riebeeck West: Storm water Management Plan Page 19
The material from the blending beds is reclaimed for clinker production in thin vertical slices
which are transverse to the longitudinal axis of the deposition, and slices tend to contain the
various components in the desired proportions.
The sand and shale mix which is processed through the crushers is stored separately in the
shale shed. When the mine has a surplus of sand / shale mixture, it is been stored adjacent to
the quarry pit (Refer to Figure 1.4).
1.5.10 Screenings
During future mining activities there will be a need to screen out the fines from the mineral
resource. These fines are regarded as screening. Historically the screens were conveyed to a
screening dump (See Figure 1.5). However there in no space available for future screening to
be placed on the existing screening dump. Therefore PPC Riebeeck will need another solution
for the disposal of screening.
One such solution could involve the slurrying of the screenings and pumping the slurry to a
settlement dump created within the existing overburden areas. The water from the settlement
dam would be recycled back to the plant. The settled out screenings would then be covered
with overburden.
1.5.11 Concurrent rehabilitation / conservation
Concurrent rehabilitation includes, backfilling mined out areas (sand mining area), the
rehabilitation of the overburden dumps, protection and upkeep of the Renosterveld and the
removal of alien vegetation.
The main backfilling of mined out areas will involve the intended future backfilling of the
overburden from the Delectus pit area into the Final pit. There is currently backfilling taking
place within the southern section of Block B and in the sand mining area.
Overburden dumps are profiled as per the overburden dump design through dozing, grading
and terracing. Once profiled, they are covered in topsoil and re-vegetated as per the
requirements for future farming. Sub soil and topsoil are analysed to ensure suitability for future
farming requirements. Storm water control and the control of potential erosion are considered
during the design and development of the dumps.
The main invader species of concern at PPC Riebeeck is Rooikrans (Acacia cyclops), Port
Jackson (Acacia saligna), Longleaf wattle (Acacia longifolia), and Mesquite (Prosopis sp.). PPC
Riebeeck has developed and will implement an alien vegetation removal programme.
Within the mining property is an area of Renosterveld vegetation which is of high conservation
importance. In recognition of its conservation value, PPC Riebeeck will implement
management measures to protect and conserve the area. This will be undertaken under the
guidance of a suitably qualified botanist.