Water is a natural resource of high significance for human beings, fauna and flora. Therefore, the protection of water resources is one of the highest aims of each industrial site. The mining sector and its subsectors have a lot of applications for water, also causing a high potential to interfere with water systems. Mineral extraction, mineral resource storages, mineral processing and mine waste storage form important potential pollutant emitters. The weathering of sulphidic minerals cause the most severe mine-water-related problems, because it involves a decrease in the pH level as well as an increase in dissolved total solids, especially metal concentrations. This acid mine waters are categorized as acid mine drainage. The drainage of acidic water represents the biggest conflict between mining and environment in the world.
This thesis deals with the characterization of waterbodies impacted by acid mine drainage. A discussion of the fundamental processes forms the basis of this paper. The classification of mine drainage, the weathering of pyrite and potential pollution sources are discussed in detail. However, impacts of acid mine drainage, drinking-water-specific values and legal and political aspects are mentioned as well. Based on this theoretical part, various international, especially European case studies will be reviewed. Each of these examples includes a brief introduction to the general mine-water related situation and with a focus on a specific development of the site, thus ensuring to illustrate the complexity of this environmental concern. Finally, a conclusion is drawn from the discussion of the case studies, complementing the theory part.
Contents
1 Introduction
I Acid mine drainage theory
2 Classification of acid mine drainage
3 Acid mine drainage process
3.1 Sulphide weathering
3.2 Metal dissolution
3.3 Process acceleration
3.4 Acidity buffering
3.5 Metal precipitation
4 Sources of acid mine drainage
4.1 Active surface mining
4.2 Abandoned surface mining
4.3 Active underground mining
4.4 Abandoned underground mining
4.5 Waste rock and ore stockpiles
4.6 Tailings
4.7 Others
5 Effects and impacts of acid mine drainage
6 Legal and political aspects of Acid Mine Drainage
6.1 Water in political and socio-economic tension - an introduction
6.2 Drinking-water limit values
6.3 The European Union’s political and legal instruments
6.4 Voluntary international mining-related environmental guidelines
II Case Studies
7 Introduction
8 Rio Tinto and Rio Odiel, Spain
9 Avoca River, Ireland
10 Mine water contamination in Scotland
11 Rötlbach, Austria
12 Gromolo Creek, Italy
13 Acid Mine Drainage in Macedonia
14 Alaşehir Mine, Turkey
15 Ankobra River, Ghana
16 Banjar River, India
17 Acid Mine Drainage in Tasmania, Australia
18 Iron Mountain Mine, U.S.A.
19 Concluding summary of case studies
Research Objectives and Core Topics
This thesis investigates the characterization of waterbodies impacted by Acid Mine Drainage (AMD), examining the underlying chemical and geological processes that lead to water contamination. It aims to bridge theoretical knowledge of AMD generation with practical, global case studies to illustrate the environmental complexity and socio-economic implications of mine-related water pollution.
- Chemical processes of sulfide weathering and metal dissolution
- Classification and environmental impact of different mine drainage types
- Assessment of anthropogenic sources including surface, underground, and waste storage mining sites
- Regulatory and political frameworks governing mine water quality
- Empirical review of international case studies demonstrating diverse ecological consequences
Excerpt from the Book
3.1 Sulphide weathering
At the beginning of AMD there are three requirements (also see process reactions below):
water
oxygen
sulphidic minerals or mining waste
Both surface and underground mining may allow oxygen to reach parts of the sulphidic deposit. This encounter is the basis for the weathering of those minerals. A mineral within a structure may have three options of reactions:
to produce acid
to buffer acid
to stay neutral
The sum of all weathering reactions determines whether the dissolved weathering products turns the containing medium (water, waste, etc.) acid or not [40, p. 32].
The AMD formation process begins when pyrite is confronted with oxygen. There are four major possibilities of pyrite oxidation [40, p. 32]:
1. Abiotic direct oxidation
2. Biotic direct oxidation
3. Abiotic indirect oxidation
4. Biotic indirect oxidation
Resulting from the above listing, pyrite oxidation can take place with or without the presence of microorganisms, even directly or indirectly. The difference between direct and indirect may be explained easily. For a direct oxidation (abiotic or biotic) oxygen is used as oxidant, whereas for indirect oxidation oxygen and ferric iron are needed [40, p. 32].
Summary of Chapters
1 Introduction: Provides an overview of the global dependency on mineral resources and the resulting environmental challenges, focusing on the impact of Acid Mine Drainage on waterbodies.
2 Classification of acid mine drainage: Defines the four categories of mine drainage—extremely acid, acid, neutral, and saline—based on chemical parameters and pH levels.
3 Acid mine drainage process: Details the chemical mechanisms of AMD generation, including sulfide weathering, metal dissolution, process acceleration by microorganisms, acidity buffering, and mineral precipitation.
4 Sources of acid mine drainage: Examines various anthropogenic sources, ranging from active and abandoned surface and underground mining to waste rock piles and tailings.
5 Effects and impacts of acid mine drainage: Discusses the environmental consequences of AMD, specifically addressing the contamination of surface water, sediment, and groundwater, as well as the impact on flora and fauna.
6 Legal and political aspects of Acid Mine Drainage: Outlines global and European political instruments, drinking-water guidelines, and international environmental regulations related to mining.
7 Introduction (Case Studies): Sets the stage for the second part of the thesis by identifying global case study areas and their relevance in understanding diverse mine water problems.
8 Rio Tinto and Rio Odiel, Spain: Analyzes the large-scale, historic AMD contamination in the Iberian Pyrite Belt and its effect on the regional riverine systems.
9 Avoca River, Ireland: Explores the long-term impact of abandoned copper mines in Wicklow county and the importance of sediment analysis in monitoring contamination.
10 Mine water contamination in Scotland: Discusses the significance of net-alkaline mine water in coal mining areas and explains why pH values remain near-neutral despite the presence of metals.
11 Rötlbach, Austria: Highlights a non-mining related natural acid drainage example to illustrate mineral precipitation and natural contamination pathways.
12 Gromolo Creek, Italy: Focuses on the Libiola mine area, comparing colored and uncolored mine waters and assessing the role of tailings as primary pollutant sources.
13 Acid Mine Drainage in Macedonia: Provides an overview of AMD across various lead, zinc, copper, and arsenic mines in Macedonia, illustrating a nation-wide environmental challenge.
14 Alaşehir Mine, Turkey: Investigates the contamination issues at an abandoned mercury mine, emphasizing the impact of calcine piles and river water chemistry.
15 Ankobra River, Ghana: Reviews the combined impacts of large-scale and artisanal gold mining in the Ankobra river basin, noting seasonal variations in pollutant concentrations.
16 Banjar River, India: Examines the Malanjkhand copper mine, discussing heap leaching processes and the specific impacts on both the aquatic environment and local flora.
17 Acid Mine Drainage in Tasmania, Australia: Details the extensive inventory and management strategies implemented by the Tasmanian government to address AMD from abandoned mines.
18 Iron Mountain Mine, U.S.A.: Explores one of the most contaminated sites in the world, illustrating the extreme acidity of mine waters and the efficacy of Superfund remediation efforts.
19 Concluding summary of case studies: Synthesizes findings from all case studies to draw broader conclusions about the behavior of AMD parameters and the need for site-specific management.
Keywords
Acid Mine Drainage, AMD, Mining, Water pollution, Environmental geology, Sulfide weathering, Heavy metals, Remediation, Sustainable mining, Mine tailings, Hydrogeochemistry, Sediment contamination, Mine water management.
Frequently Asked Questions
What is the primary focus of this thesis?
This work focuses on the characterization of waterbodies affected by Acid Mine Drainage (AMD), providing a systematic analysis of the chemical generation of acidic water and its environmental impacts.
What are the central thematic fields covered?
The work covers chemical processes of AMD, pollution sources from active and abandoned mining, effects on ecosystems and groundwater, legal frameworks, and various international case studies.
What is the primary research goal?
The primary goal is to provide a comprehensive, structured understanding of AMD by combining scientific theory with empirical data from diverse global locations, ultimately demonstrating the complexity of this environmental issue.
What scientific methods are utilized in the work?
The research relies on the analysis of chemical reactions (e.g., pyrite oxidation), the use of classifications like Ficklin diagrams, and a comparative study of international datasets regarding water and sediment quality.
What is the focus of the main body?
The main body is divided into a theoretical section detailing the chemical mechanisms of AMD and an empirical part that characterizes specific case studies in Europe, Africa, Asia, and the U.S.A.
Which keywords best characterize this work?
Key terms include Acid Mine Drainage, heavy metal contamination, mine tailings, hydrogeochemistry, environmental regulation, and sustainable water management.
How do dry and wet seasons affect AMD contamination in the Ankobra river basin?
Research on the Ankobra river shows that pH values and heavy metal concentrations (e.g., copper, nickel, arsenic) are typically lower during the dry season compared to the wet season, highlighting the influence of rainfall on contaminant transport.
Why is the Iron Mountain Mine considered an exceptional case study?
It is cited as one of the most contaminated mining sites worldwide, notable for producing the most acidic water found in nature (pH as low as -3.6) and for its extensive remediation history under the U.S. Superfund program.
What is the role of microorganisms in the AMD process?
Certain microorganisms, such as *Acidithiobacillus ferrooxidans*, act as catalysts that accelerate the oxidation of sulfide minerals, thereby significantly increasing the rate of acid production and metal dissolution.
- Quote paper
- Thomas Heise (Author), 2010, Characterization of Waterbodies Affected by Acid Mine Drainage, Munich, GRIN Verlag, https://www.grin.com/document/148142
