Coaltech Research Association

Zaalklapspruit Wetland Rehabilitation Monitoring

By P.J. Oberholster, T. E. Madlala and M. Thwala | 2019

R1500,00

Description

The Zaalklapspruit wetland under study has been identified as a “National Freshwater Ecosystem Area” and falls within a “critically endangered wetland” type. The Grootspruit wetland is ecologically engineered to improve its water quality and receives acid mine drainage (AMD) from an abandoned coal mine upstream. The aim of the initial study was to determine to what extent the rehabilitation of the Zaalklapspruit wetland improved downstream water quality. Improvement in the water quality was assessed through changes in pH, alkalinity, metals, TDS and electrical conductivity. The follow up study looked at the role played by groundwater-surface water interactions on the resultant water quality.

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What this report foundGrazing pressure on the rehabilitated block ran at roughly three times the estimated carrying capacity.

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What this report found

Grazing pressure on the rehabilitated block ran at roughly three times the estimated carrying capacity. The sward was dominated by low quality grasses with a high proportion of bare ground and a raised erosion risk. Fenced exclosures over one year changed the abundance of a few species, but the vegetation showed no clear direction of recovery.

Transformation of the Coal Mining Procurement Supply Chain

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Review of preferential procurement and small supplier development at South African coal producers, based on interviews with procurement staff, suppliers and accreditation agencies, with recommendations for management.

What this report foundThree modes of intervention were found in coal company procurement: preferential procurement rules, segmentation of goods and services by suitability for...

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What this report found

Three modes of intervention were found in coal company procurement: preferential procurement rules, segmentation of goods and services by suitability for transformation, and support programmes for small suppliers. Progress stalled where supplier development was handled by staff carrying other duties, since work not tied to production loses time and has no target. The remedy proposed is procurement targets linked down through commercial and production management.

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