NKOMATI ANTHRACITE (PTY) LIMITED - Sentula Mining

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Environmental Impact Assessment Report: Nkomati Anthracite (Pty) Limited, Madadeni Opencast Mining Project Page 70 rehabilitated. ANNUAL REHABILITATION DECOMMISSIONING COSTS (SUB-TOTAL) R 1 200 000 GRAND TOTAL (CONSTRUCTION, OPERATIONAL & DECOMMISSIONING ANNUAL REHAB COSTS R 9 250 000 QUANTUM FOR FINANCIAL PROVISION INCLUDING CONTINGENCIES AND VAT (SUBMITTED TO DMR) R 4 122 282 NKOMATI ANTHRACITE (PTY) LIMITED COMPILED BY GEOVICON ENVIRONMENTAL (PTY) LTD
Environmental Impact Assessment Report: Nkomati Anthracite (Pty) Limited, Madadeni Opencast Mining Project Page 71 6.4 R E S I D U A L IM P A C T S PO S T M I N I N G Residual impacts post mining, in context of this document, is taken as all potential impacts, which may arise as a result of the mining activities on the proposed Madadeni Opencast mining area following the decommissioning phase. Note that no partial closure will be applied for. 6.4.1 G e o l o g y During the life of the mine, approximately 1.4 x 10 6 tons of coal will be removed from the proposed Madadeni mining project area. The geological profile (target coal seam and overlying strata) on the proposed Madadeni mining project area, covering an area of approximately 54ha, will have been permanently disturbed by opencast mining. Note, however, that a core function of any mine is to remove geological material. No surface subsidence is expected after mining. The residual impact of mining on geology will therefore be the disruption of the geological profile. No mitigation measures are predicted for the impacts on geology. 6.4.2 T o p o g r a p h y During closure, all surface activities that would have impacted on the topography i.e. pollution control dam, R.O.M coal stockpile area and all other mine infrastructure would have been removed. In view of this, the surface area will be free draining and approximate the pre-mining surface, hence no residual impacts are expected. 6.4.3 S o i l s All soils from the subsoil and topsoil stockpiles would have been utilized during the decommissioning phase. The area will then be seeded with the recommended seed mix identified to prevent soil loss and erosion. Since the topsoil stockpile height will not exceed the height of 4m, no significant loss of soil chemical properties is expected. However, if it is found that the fertility of the soil has been reduced to critical levels the soils will be fertilised before use, during rehabilitation. During the rehabilitation, topsoil layer will be spread over the rehabilitated areas and seeded. As far as possible rehabilitation of the area will be conducted such that the soil distribution and depths approximate that of the pre-mining environment. No significant residual impacts on soil will therefore occur. 6.4.4 L a n d U s e an d C a p a b i l i t y It is however not possible to immediately restore the land capability of the rehabilitated area to premining land use, hence the after mining land capability of the mined out area will remain grazing. Until the biological activity of the soils has been restored and its stability is ensured the soils cannot be considered arable. This activity will take approximately three to four years of management and maintenance. In view of the above, the after mining land use will be grazing until such time that the soils in the area is suitable for use as arable land. No significant residual impacts on land capability will therefore occur. 6.4.5 Na t u r a l V e g e t at i o n Seeding of all rehabilitated areas during the decommissioning phase will ensure that a sustainable vegetation cover will establish in the mining area within 2 – 4 years. A vegetation cover suitable for grazing land use will be established. No significant residual impacts on vegetation will therefore occur. NKOMATI ANTHRACITE (PTY) LIMITED COMPILED BY GEOVICON ENVIRONMENTAL (PTY) LTD
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NKOMATI ANTHRACITE (PTY) LIMITED - Sentula Mining

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