Plans to prospect for limestone across nearly 4,720 hectares between Bredasdorp and Cape Agulhas in South Africa's Overberg region have sparked concerns among conservationists and landowners. The proposed prospecting programme, submitted by Ikwezi Mining Ventures (Pty) Ltd, includes drilling approximately 25 boreholes, some up to 250m deep, along with access roads and drill pads. This has raised concerns that the drilling could affect one of the region's most biologically diverse and environmentally sensitive landscapes.
The Agulhas Plain, where the prospecting will take place, is internationally recognised for its exceptional plant diversity, with around 2,000 indigenous plant species recorded by SANParks, including endemic species and over 110 Red Data species. Limestone mining has previously been identified as a potential threat to several threatened species in the area, specifically between Bredasdorp, Struisbaai, and Arniston. The region's unique biodiversity has prompted concerns from conservationists and landowners about the potential impacts of limestone prospecting and potential mining.
The prospecting area lies along the Kars River, part of a connected water system linked to the Nuwejaars wetlands and Soetendalsvlei, according to Ross Kettles, CEO of the Nuwejaars River Nature Reserve. Kettles warned that any future limestone mining operation could have downstream implications, particularly if it affects water quality, groundwater, or river flows. The extent of any impact would depend on the eventual operation and specialist assessments, he added.
Local wine farmer Bruce Jack has expressed concerns about the wider environmental and social consequences of large-scale mining and cement production. He cited potential increases in heavy-vehicle traffic, road deterioration, and pressure on surrounding communities. Jack also questioned the number of jobs that would be created for local unskilled workers, considering that the mining operation would be highly mechanised. He described the area between Bredasdorp, De Hoop Nature Reserve, and Arniston as "an incredibly sensitive natural environment".
Elsaine Rabie, legal consultant to the Save Overberg Coalition, has questioned the need for prospecting given the existence of an limestone mine in the area. Rabie noted that prospecting is often presented as low-impact but can involve drilling and other invasive work. She emphasised that prospecting is significant because it gives the holder exclusivity to apply for a mining right, making the application particularly important for communities to scrutinise.
According to Ikwezi's background-information document, the final environmental report is to be submitted to the Department of Mineral and Petroleum Resources by 17 October. Before submission, draft documentation must be made available to interested and affected parties for comment. The environmental impact will depend on specialist studies that will ascertain whether sensitive areas and species can be avoided, including both terrestrial and aquatic biodiversity assessments.
The Save Overberg Coalition and other stakeholders will be closely monitoring the prospecting application and its potential implications for the region. More information is available on the Save Overberg Ikwezi information page. Key stakeholders will need to balance the potential economic benefits of limestone mining against the potential environmental and social costs. The outcome of this process will likely have significant implications for the future of the Overberg region.
Key points
- Conservationists and landowners have raised concerns over the potential environmental impacts of limestone prospecting in South Africa's Overberg region.
- The prospecting programme includes drilling approximately 25 boreholes and could affect the region's unique biodiversity and water resources.
- The final environmental report is to be submitted to the Department of Mineral and Petroleum Resources by 17 October.
