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Table of Contents
In essence, environmental impacts from mining are those that directly and indirectly affect ecological and human health. The type of mining and operations results in different environmental and human health impacts but they can generally be grouped into major categories. Those categories are:
Metal contamination of ground and water
In either open-pit or underground mine sites, both mining methods pose the risk of water contamination through contact with surface water or groundwater. Contamination of groundwater may cut off or limit the supply to nearby areas. For surface water, dissolved metals like sulfates, radio-nuclides, and nitrates may travel through streams, or through erosion be carried to local groundwater. In reference to mining, the chemicals used in processing the ores are a source of contamination. This affects the quality of water sources in nearby communities and will affect aquatic life.
In Utah, from 1910 to 1972 the International Smelting and Refining Company (IS&R) had lead, copper, and zinc smelting and refining activities in Tooele County that caused contamination of the smelter property and adjacent lands of neighboring towns including the Lincoln Township.
Site investigations found heavy metal contamination in soils, tailings, and slag. Up to 18 inches of contaminated soil has been removed and excavated from the public, commercial, and residential affected areas. Capping was also implemented on areas where the soil was not removed, fences were installed in restricted areas that cannot be remediated due to access limitations and physical hazards, and contaminated soil up to 24 inches thick is removed and backfilled with clean ones to revegetate the area. The site remediation process took 11 years from 2000 to 2011, the site is now known as the Pine Canyon Conservation Area.
Physical Impacts
Structural instability
Structural instability in mining is when the soil aggregates are unable to resist degradation caused by changes to the surrounding soils. In mining, instability is most often seen around tailings disposal systems – especially with older mine sites. When the stability of the tailings fails it could result in the release of contaminants into the environment and waterways.
In 1972 at Buffalo Creek, West Virginia, Pittston Coal’s slurry impoundment collapsed due to heavy rain releasing 500,000 m3 of tailings that traveled 27 km downstream, demolishing 500 homes, 125 casualties, and $65 million in property damage. This disaster has a significant impact in the country and it has lead to senate hearings that passed Public Law 92-367 and the creation of the National Dam Safety Program that focuses on creating dam safety programs to reduce the risk to human life, property, and the environment from dam related hazards.
Using the lessons from the past, tailing systems today are being designed to take into consideration the physical characteristics of the waste material as well as conditions on-site. Nowadays, most tailing disposal systems have special liners and are equipped with earthquake-ready measures.
Slope Failure
For our purposes, slopes in mine sites are either cut or manufactured. Cut slopes are slopes created from the removal of ore or overburden rocks from the surface of an undisturbed landscape. Manufactured slopes are the slopes created in piling and dumping waste rock, overburden, and tailings. Slope failure tends to spread these wastes, releasing toxic or reactive materials to its surroundings.
Manefay Landslide
In 2013, the Bingham Canyon copper minefield in Utah operated by Rio Tinto-Kennecott had two consecutive avalanches that displaced a total of 65 to 70 million m3 of dirt and rocks, which is considered as one of the largest non-volcanic landslides in Northern America. The Manefay Landslide has caused damage to the mine site and has resulted in significant immense economic costs. Through the installed interferometric radar system, movement of up to 2 inches a day were detected and warnings are sent out to the workers and nearby communities that a landslide is imminent. Mining operations were shut down a day before the landslide and there were no injuries or casualties. Though anticipated, the extent of damage was unexpected, destroying large mining shovels, thirteen 320 ton trucks, roads, buildings, and other equipment and supplies.
There are many methods in measuring safety parameters from the combination of the earth to satellite-based technologies or traditional to remote sensing techniques to manage or predict slope instabilities. Proper design analysis through numerical modeling, as well as analytical, and empirical techniques to identify zones of weakness and probability of slope failures provides information to which site managers can strategize risk management plans from.
Subsidence
Subsidence is the lateral ground movement resulting from the collapse of an overlying layer into an underground mine cavity. Subsidence occurs in underground mine sites when pockets of unfilled rooms or collapsing supports and pillars are triggered by surface movements. Sinkholes and land troughs are manifestations of subsidence and are highly destructive to the community that is unaware of the extent of the excavation activity of old, inactive or abandoned underground mines.
In Pennsylvania, where coal and clay mining began for over 200 years, the state is still dealing with mine subsidence threats as more than 1 million residential homes are situated above lands that are historically mined using the room and pillar method. Mine subsidence is devastating and destructive not only to the structures above it but it also affects the overlying aquifer’s drainage patterns, misdirection of streams, and disruption on wells and irrigation systems.
Even though the timing and extent of subsidence damage are inevitable, there are some remediation techniques and prevention measures that can be implemented. For room and pillar mines with insufficient pillar support, backfilling with rock, mine wastes, or cement grout can be applied until mined out voids are filled. Roof supports and the construction of grout columns can be implemented to prevent subsidence as well.
Physical Impacts of Mining Activities on Environment and Communities
Acid mine drainage (AMD) is the outflow of acidic water that is generated in the oxidation of pyrite or iron ores rich in sulfur. It is also commonly referred to as Acid Rock Drainage (ARD). Acid is produced when mined materials such as excavated host rocks with metal sulfide minerals are exposed to air and water. Acid drainage sites may contain dissolved metals like lead, copper, silver, iron, and zinc. High concentrations of these dissolved metals affect aquatic life and the quality of water in streams.
Iron Mountain Mine
The US mining industry considers acid drainage as its largest environmental problem. It may occur rapidly or it may take years to manifest and exhaust its full damage extent. The Iron Mountain Mine or Richmond Mine’s 4,400-acre land has been mined for many resources such as iron, copper, gold, silver, and zinc for more than 100 years until mining operations halted in 1963. Even after mining in the Richmond mine was stopped, the mining activities have left the mountain fractured. Its minerals were exposed to rain and air that leached heavy metals like cadmium and copper to seep out of the mine site and reach the Spring Creek Reservoir. The acidic water with low pH levels and high metal concentrations have resulted in fish kills, including the migrating salmons in the 1940s, the elimination of other aquatic life and contamination of potable water of neighboring communities in Spring Creek, Boulder Creek, and Slickrock Creek as well.
The occurrence and extent of acid mine drainage vary from site to site depending on the generation factor or the capability of a material to react and produce acid. Physical factors such as the waste structure, particle size, permeability, and the local hydrology are contributors that will affect the site’s potential to produce AMD.
Cyanide
Cyanide is used in the beneficiation process during gold and silver recovery. In low doses, cyanide is acutely toxic to humans and according to the International Cyanide Management code, commercial gold operations only typically use 100 to 500 parts per million (.01 to 0.05%) of cyanide. Fish kills happen when the cyanide is spilled due to the tailings dam design failure or poor waste management practices.
The Summitville Mine in Rio Grande County, Colorado has been mined from the 1870s up until 1992 when a cease and desist order from the state government was issued due to the alarming contamination levels in the area affecting nearby creeks and community. Concerns on the run-off of excess water from the heap leach pad- an estimate of 320 m3 had leaked from the damaged liner. Another major cyanide release was caused by a pump failure that resulted in a fish kill downstream along the Alamosa River.
Cyanide is a toxic material that can be ingested or inhaled and constant exposure could be lethal. Nowadays, the use of cyanide has declined as less harmful alternatives are already available in the market. The chemical was mostly used during the 70s and 80s – but began to decrease in the 90s due to political pressure and environmental impacts.
Air emissions
Gaseous and particulate emissions are both released in heat treatment, beneficiation, mining, and mineral processing. Particulate Matter (PM) released from mining have sizes ranging from 2.5 micrometers (PM2.5) to 10 micrometers (PM10) of aerodynamic diameter.
PM10 coarse particles can form into fugitive clouds of dust that are generated from mining activities like blasting, loading, hauling, dumping waste rocks, as well as crushing activities. PM2.5 covers all suspended particulate matters that are less than 2.5 micrometers in diameter and are mostly released from other combustion processes. Flue dust comes from sinter, roaster, and refinery stacks. The spread of fine particulate matter is dependent on the height of the stack. While the release is in low concentration, the deposition of the metals over time, decades to centuries, becomes substantial to contaminate the air and soil.
Air emissions can cause an adverse effect on the respiratory health of the people living near mine sites. Studies show that the exposure of the locals to both fine and coarse particles have a correlation to increased hospital respiratory disease admissions, restricted activity days, and respiratory symptom cases attributable to the direct impact of the mining [16].
State agencies such as the Environmental Protection Agency (EPA) have regulatory actions and mandates that set specific targets for operators to follow in order to legally enforce commitment to the reduction of air emission risks. The Clean Air Act has also established standards that operators must meet and comply to regulate the release of air pollutants for the protection of the community and the safety of the mineworkers.
Environmental pollution is a widely discussed topic with air, water, and soil being polluted in today’s rapidly progressing society. Soil, being a “universal sink,” is significantly at risk of the effects of environmental pollution. Soil pollution occurs when chemicals or substances which are not naturally present are found in soil
Throughout the past few years, companies all around the country have made it a goal to ensure that they are running as sustainably as possible. In many cases, both the public and a company’s stakeholders have demanded changes be made to the way a company conducts itself. However, it can
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Frequently Asked Questions
What are the main environmental impacts of mining operations?
The main environmental impacts of mining operations include habitat destruction, soil degradation, water pollution, and air quality deterioration, which can harm local ecosystems and human health. These effects necessitate careful management and mitigation strategies.
What are the effects of mining on regional ecosystems and biodiversity?
The effects of mining on regional ecosystems and biodiversity include habitat destruction, pollution, and a decline in species diversity. These impacts can disrupt ecological balance and threaten the health of both wildlife and surrounding communities.
Can mining operations cause soil contamination and erosion?
Mining operations can indeed cause soil contamination and erosion. These activities disrupt the land, leading to the release of pollutants and increased vulnerability to erosion, significantly impacting local ecosystems and soil health.
Can mining activities contaminate groundwater sources?
Mining activities can indeed contaminate groundwater sources. Through the release of harmful chemicals and the disruption of natural barriers, mining operations pose significant risks to water quality, potentially affecting both ecosystems and human health.
What are the air pollution effects of iron ore mining?
The air pollution effects of iron ore mining include the release of dust and particulate matter, which can degrade air quality and harm respiratory health in nearby communities. Additionally, emissions from mining equipment contribute to overall air pollution, affecting ecosystems and climate.
How do mining operations impact air quality and climate change?
Mining operations significantly impact air quality and climate change by releasing dust, particulate matter, and greenhouse gases. These emissions contribute to air pollution and exacerbate global warming, affecting both ecological systems and human health.
How does mining impact local biodiversity and ecosystems?
Mining impacts local biodiversity and ecosystems by disrupting habitats, leading to the loss of plant and animal species, soil degradation, and water contamination. These changes can create long-term ecological imbalances and threaten the health of surrounding communities.
How does mining affect local ecosystems and biodiversity?
Mining affects local ecosystems and biodiversity by disrupting habitats, altering water quality, and releasing pollutants. These changes can lead to the decline of plant and animal species, threatening overall ecological balance and health.
How does mining affect nearby water sources and aquatic life?
Mining activities can significantly impact nearby water sources and aquatic life by causing pollution through sediment runoff, chemical spills, and altered water flow patterns, leading to habitat degradation and reduced biodiversity in aquatic ecosystems.
What are the effects of mining on wildlife habitats and species?
The effects of mining on wildlife habitats and species are significant, leading to habitat destruction, fragmentation, and pollution, which can result in declining populations and threats to biodiversity.
Can mining operations lead to deforestation and land degradation?
Mining operations can indeed lead to deforestation and land degradation. The extraction process often involves clearing vast areas of forest and disrupting ecosystems, which can result in loss of biodiversity and soil erosion.
What are the water pollution risks from mining operations?
The water pollution risks from mining operations include contamination from heavy metals, toxic chemicals, and sediment runoff, which can harm aquatic life and disrupt local ecosystems, posing significant threats to both environmental and human health.
How do mining operations contribute to climate change?
Mining operations contribute to climate change by emitting greenhouse gases through energy-intensive processes, deforestation, and the disruption of soil and vegetation. These activities release carbon stored in natural resources, further exacerbating global warming and environmental degradation.
What are the environmental consequences of abandoned mine sites?
The environmental consequences of abandoned mine sites include soil erosion, water contamination, habitat destruction, and health risks to nearby communities due to the release of toxic substances. These impacts can have long-lasting effects on ecosystems and public health.
What are the environmental effects of coal mining on land ecosystems?
The environmental effects of coal mining on land ecosystems include habitat destruction, soil degradation, and water pollution, which collectively disrupt local biodiversity and impair the health of surrounding ecosystems.
How does mining impact local water sources and aquifers?
Mining operations can significantly impact local water sources and aquifers by altering natural water flow, contaminating water with harmful chemicals, and reducing water quality and availability, which poses risks to both ecosystems and community health.
What mitigation strategies reduce minings environmental impact?
Mitigation strategies that reduce mining's environmental impact include implementing erosion control measures, using water recycling systems, restoring habitats post-mining, and adhering to stricter regulations on emissions and waste management. These practices aim to minimize ecological disruption and promote sustainability.
How does mining affect soil health and fertility?
Mining operations negatively affect soil health and fertility by disrupting the topsoil, altering nutrient availability, and leading to erosion and contamination. This degradation can compromise agricultural productivity and harm local ecosystems, making proper environmental management essential.
What role do regulations play in mining impacts?
Regulations play a crucial role in managing the environmental impacts of mining. They set standards for operations, ensuring that companies minimize negative effects on ecosystems and comply with safety protocols to protect human health and the environment.
How can technology minimize minings ecological footprint?
Technology can minimize mining's ecological footprint by enhancing resource efficiency, reducing waste, and implementing advanced monitoring systems. Innovations like automated equipment, cleaner extraction methods, and sustainable practices lead to lower environmental impacts and promote responsible mining.
What are community responses to mining environmental effects?
Community responses to mining environmental effects often include advocacy for stricter regulations, engagement in local government discussions, organized protests, and participation in environmental assessments to ensure a sustainable approach to mining practices.
How does mining affect air quality downwind?
Mining operations can significantly impact air quality downwind by releasing dust, particulate matter, and harmful gases into the atmosphere, which can lead to respiratory issues and environmental degradation for nearby communities and ecosystems.
What are the consequences of mining on local fauna?
The consequences of mining on local fauna include habitat destruction, decreased biodiversity, and disruptions to migration patterns. These impacts can lead to population declines and threaten the survival of various species in affected ecosystems.
How to assess mine closure environmental impacts?
Assessing mine closure environmental impacts involves evaluating potential ecological consequences, including habitat disruption and water quality changes. This process typically includes environmental monitoring, risk assessments, and stakeholder consultations to ensure comprehensive understanding and management of impacts.
What are the long-term effects of mining on landscapes?
The long-term effects of mining on landscapes include habitat destruction, soil degradation, and altered water flow, leading to increased erosion and loss of biodiversity. These changes can significantly impact local ecosystems and communities for generations.
How do mining practices impact carbon emissions?
Mining practices significantly impact carbon emissions by releasing greenhouse gases during excavation, transportation, and processing of minerals. Additionally, land disturbances associated with mining contribute to reduced carbon sequestration, further exacerbating climate change.
What technologies monitor minings water pollution effects?
Technologies that monitor water pollution effects from mining include remote sensing, water quality sensors, and geographic information systems (GIS). These tools help track contaminants and assess their impact on surrounding ecosystems in real-time.
How does mining land reclamation work after closure?
Mining land reclamation involves restoring mined land to a usable state after closure. This process typically includes reshaping the land, replacing topsoil, and planting native vegetation to promote ecological balance and ensure the area can support wildlife and human activities again.
What partnerships address minings environmental challenges?
Partnerships that address mining's environmental challenges include collaborations between mining companies, environmental organizations, government agencies, and local communities to develop sustainable practices, improve regulatory compliance, and implement effective reclamation and conservation strategies.
How does mining alter natural water flow patterns?
Mining operations significantly alter natural water flow patterns by disrupting the land, removing vegetation, and changing the terrain. This can lead to increased runoff, sedimentation, and changes in groundwater levels, ultimately impacting local ecosystems and water quality.
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