Kiera Jefferson
South Africa's water resources are under threat from mining activities, with pollution from mines impacting the quality of water. Mining has been identified as a significant contributor to water pollution in South Africa, with acid mine drainage, contaminated wastewater, and seepage from dams all playing a role in degrading water sources. The effects of mining pollution extend beyond the immediate vicinity of mines, as pollutants can travel through food webs and impact river water, plants, and animals. Communities living near mines have reported respiratory illnesses and water pollution, and mining has also led to the loss of agricultural land. While mining accounts for a small percentage of South Africa's water consumption, the pollution it generates can have severe consequences for the country's water resources. Efforts are being made to reduce water use and pollution in the mining industry, but the challenges remain significant.
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What You'll Learn
Acid mine drainage in Gauteng
Acid mine drainage (AMD) is a significant environmental issue in South Africa's Gauteng province, threatening water sources, ecosystems, and human health. AMD is caused by the weathering, leaching, and microbial action of sulfur-containing minerals when they come into contact with oxygen and water. The resulting water discharge is highly acidic and contains high levels of metal ions, including arsenic, chromium, copper, iron, lead, zinc, and manganese.
In Gauteng, AMD has severely impacted the Vaal River and its tributaries. In 2002, an abandoned gold mine near Krugersdorp began discharging approximately 15-20 million liters of AMD per day into the river system, which ultimately feeds into the Vaal Dam—the primary water source for Gauteng. The pollution has affected the water quality in the Vaal River and its tributaries, with high acidity and elevated concentrations of toxic metals.
The impact of AMD extends beyond the immediate vicinity of the mines. It can contaminate land and water sources up to 20 kilometers away. In Gauteng, this has resulted in polluted streams, irrigation sources, and soil adjacent to the Klip River, which flows southwest of Soweto. The residents of Soweto, particularly those living closest to the mine dumps, are exposed to the toxic effects of AMD, which has contaminated their water and soil.
The government has offered incentives to mining companies to address the AMD issue by pumping and treating the contaminated water. However, these efforts have not been entirely successful. Experts have played a crucial role in addressing the AMD problem, but disagreements and uncertainties about the best treatment and management options remain.
The treatment of AMD is challenging and often involves metals precipitation and neutralization, which produces a significant volume of toxic sludge. While treatment can make the water suitable for supply to the community, it is essential to explore sustainable solutions and technologies to manage AMD effectively and protect water resources in Gauteng and beyond.
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Water pollution in Wonderfontienspruit
Mining has had a significant impact on South Africa's water resources, with various studies indicating that water pollution from mining activities is a widespread issue. One of the primary concerns is acid mine drainage, which occurs when water decanting from mines is highly acidic and cannot be safely released into natural watercourses. This type of pollution has contaminated rivers, streams, and groundwater sources, affecting both the environment and local communities.
In the context of Wonderfonteinspruit, a small river situated in the Highveld region of South Africa, water pollution has been a longstanding issue. The river has been impacted by acid mine drainage and uranium pollution resulting from gold mining activities in the region. Since the mid-1960s, uranium (U) pollution in the Wonderfonteinspruit has been a concern, with recent media attention bringing increased focus on the potential health risks associated with contaminated water.
Studies have shown that the water quality in the Wonderfonteinspruit catchment area is below standard due to the presence of acid mine drainage and uranium pollution. The river's six impoundments, including dams such as the Tudor Dam, have been deemed unsafe for public use due to radioactive materials and acid mine runoff. These dams were once used for recreation and sustenance, including fishing, drinking water for cattle, and irrigation, but pollution has rendered them unsuitable for these purposes.
The impact of mining-related pollution in the Wonderfonteinspruit extends beyond the immediate area. The river's water flows into other water bodies, potentially spreading pollution further. Additionally, the presence of uranium and other contaminants in the water poses risks to human health, as similar levels of uranium pollution in other regions have been linked to increased incidences of leukaemia in residents.
To address the issue of water pollution in the Wonderfonteinspruit and other affected areas, various interventions have been proposed and implemented. These include pollution prevention at the source, water treatment and neutralization of acid levels, and the reuse and recycling of water to minimize the volume of polluted water. In some cases, treated effluent discharge may be considered as a last resort. The South African government has also prioritized water reuse and recycling, providing funding for the treatment of mine-impacted water to ensure the country's water security.
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$89
Heavy metals in water
South Africa is home to nearly 30% of the world's discovered mineral reserves, with half of the world's platinum group metals deposits, 36% of the world's gold, and 20% of cobalt. The country's mining industry has had a detrimental impact on its water resources.
Acid Mine Drainage
Acid mine drainage is a significant issue in South African mines, particularly in coal and gold mines. This type of drainage occurs when water comes into contact with sulphide minerals in the presence of oxygen, resulting in the production of acidic water. The water discharged from mines is often highly acidic and cannot be safely released into natural water sources such as streams and rivers. This has led to the pollution of water sources near mining areas, affecting both surface water and groundwater.
Heavy metals are a significant concern in South Africa's water pollution. Mining activities have led to the release of heavy metals into water sources, posing risks to both the environment and human health. Heavy metals such as arsenic, cadmium, lead, zinc, copper, cobalt, nickel, and mercury have been found in water bodies near mining sites. These metals can have toxic effects on aquatic life and can accumulate in the food chain, ultimately impacting human health.
Impact on Local Communities
The impact of heavy metal pollution in water is particularly evident in communities near mining sites. In Soweto, South Africa, residents have been exposed to contaminated water and soil due to acid mine drainage. This has affected their vegetable gardens and the surrounding environment, including the Klip River. Similar issues have been reported in other parts of South Africa, such as the Bushveld platinum mining complex, where different functional feeding groups of macroinvertebrates showed varying metal accumulations.
Health Risks
Exposure to heavy metals in water can pose serious health risks to humans. High levels of lead in water have been linked to lead poisoning, as seen in the Broken Hill mine case in Zambia, where a class action lawsuit was filed against a mining company. Additionally, chronic exposure to heavy metals has been associated with skin lesions, cardiovascular disease, cancer, and reproductive defects.
Remediation Efforts
Some efforts have been made to address the issue of heavy metal pollution in South Africa's water. The government has offered incentives to mining companies to pump away acid mine drainage and prevent its continuous leakage into rivers and streams. However, these efforts have been insufficient, and further measures are needed to protect water sources and the health of affected communities.
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Gold mine pollution in Soweto
Gold mine pollution is poisoning Soweto's water and soil, according to a recent study. The study, conducted by environmental scientists Salerwe Mosebi, Khayalethu Ntushelo and Lesego Khomo, found that acid mine drainage from Johannesburg's estimated 278 abandoned mines and 200 mine dumps has contaminated streams, irrigation water sources, and soil on the land adjacent to the Klip River, which flows south and west of Soweto. The contamination includes heavy metals such as uranium, arsenic, copper, cobalt, nickel, lead, and zinc, and has severe health risks for residents.
Soweto, located south-west of Johannesburg, is home to 1.9 million people who are exposed to acid mine drainage. The pollution has disrupted the delicate microbial networks important for a healthy environment and poses health risks to residents. In very mild doses, exposure to the heavy metals in acid mine drainage can cause dehydration and abdominal pain. In more severe cases, it can lead to birth defects, brain damage, cancer, and miscarriages.
The problem of acid mine drainage is not unique to Soweto; it is a common issue in gold and coal mines worldwide. However, the impact on Soweto is severe, with residents living near mine dumps being the most affected. The government has offered incentives to mining companies to address the issue, but the efforts have been insufficient.
Artisanal miners, known locally as "zama-zamas," are re-mining the dumps and are extremely exposed to heavy metals as they handle the acid mine drainage without protective clothing. Residents of Soweto have relied on vegetable gardens to supplement their income and meet their nutritional needs, but these food gardens are now at risk due to the pollution.
The contamination from the gold mines has been ongoing for 140 years, with wastewater leaking from Johannesburg's abandoned mines. The issue has affected the water quality in the immediate vicinity of mine tailings in and around Johannesburg, dispersing through groundwater plumes into perennial streams. The pollution is derived primarily from mine tailings dumps that are disused or undergoing retreatment to extract remaining gold.
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![Study and analysis of the application of saline water conversion processes to acid mine waters / by W.C. Schroeder and J.M. Marchello ; for the Office of Saline Water. 1966 [Leather Bound]](https://m.media-amazon.com/images/I/61IX47b4r9L._AC_UY218_.jpg)
Water treatment and prevention
South Africa's mineral extraction and processing industries are crucial to the country's economy, but they face significant challenges related to water resources. Water scarcity and pollution from mining activities are two critical issues. Acid Mine Drainage (AMD) is a significant environmental problem in South Africa, where the oxidation of sulfide minerals exposed during mining results in highly acidic water. This contaminated water can leach heavy metals into surrounding water bodies, endangering aquatic ecosystems and human health.
To address the issue of AMD, South Africa has implemented several measures and technologies for water treatment and prevention:
- Pollution Prevention at Source: The National Water Act (NWA) of 1998 requires mines to take measures to prevent water resource contamination and ensure that water used in their processes is recycled as much as possible. The proposed Mine Water Management Policy (MWMP) aims to improve water quality management and reduce water pollution.
- Re-use and Recycling of Water: The South African government promotes the re-use and recycling of water for industrial and agricultural purposes to ensure water security. Incentives include annual funding of R600 million for treating mine-impacted water (MIW), with 67% of the cost recovered from polluting mining operations through an environmental levy.
- Treatment of Effluents: If pollution cannot be prevented through source control or recycling, the next step is to treat the effluents. Treatment technologies such as ultrafiltration and reverse osmosis have been employed in projects like the eMalahleni Water Reclamation Project (EWRP), which addresses AMD pollution and water scarcity.
- Bioremediation Techniques: Researchers are exploring the use of microorganisms, including genetically engineered microbes, to break down toxic substances in water, providing a natural and sustainable method for water purification.
- Advanced Water Management: South Africa is investing in innovative water management practices and pollution control technologies to ensure sustainable mining operations. This includes the use of machine learning and artificial intelligence to optimize water management systems and predict water demand.
- Desalination and Recycling Technologies: To address water scarcity, South Africa is adopting advanced desalination and recycling technologies, such as using gypsiferous or lime-treated mine water for agricultural irrigation, particularly after mine closure.
- Active and Passive Treatment: Active treatment methods like lime neutralization, ion exchange, and carbonate neutralization are effective but require long-term commitment. Passive treatment, such as constructed wetlands, may be less costly and more area-efficient.
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Frequently asked questions
It is difficult to provide an exact figure, but a significant amount of South Africa's water is polluted by mining activities, particularly in the Gauteng province, which includes Johannesburg, and in the Witbank coalfields in the eMalahleni Municipality.
Water pollution from mining in South Africa is primarily caused by acid mine drainage, which occurs when water comes into contact with acidic minerals and metals in mines. This can contaminate water sources up to 20 kilometres away from a mine.
Water pollution from mining can have severe environmental and health impacts. It can contaminate water sources, killing microbes and other organisms, and poisoning plants and animals. It can also expose humans to high concentrations of heavy metals and radiation, leading to medical problems such as asthma, skin rashes, cancer, and organ damage.
The South African government has acknowledged the issue and is taking steps to address it. They have proposed charging mining companies for the cost of cleaning up toxic water pollution and have allocated funds for treating polluted water. Additionally, the government promotes water reuse and recycling for industrial and agricultural purposes to ensure water security.
Yes, in 2007, a collaboration between Anglo American's AngloCoal division, BHP Billiton, and the eMalahleni Local Municipality resulted in the development of the eMalahleni Water Reclamation Project (EWRP). This project utilizes treatment technologies such as ultrafiltration and reverse osmosis to address water pollution and scarcity in the city.
