What does digging minerals out of the ground do to the land and water around the mine?
Topic 5.9 Impacts of Mining: compare surface and subsurface mining and explain their environmental consequences, including acid mine drainage and tailings.
A focused answer to APES Topic 5.9, covering surface mining (strip, open-pit, mountaintop removal) and subsurface mining, their environmental consequences, acid mine drainage, tailings, habitat destruction, and reclamation, with a worked overburden calculation.
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What this topic is asking
The College Board (Topic 5.9) wants you to compare surface and subsurface mining and explain their environmental consequences, including acid mine drainage, tailings, habitat loss and reclamation.
Surface versus subsurface mining
Surface mining is cheaper and recovers more of the deposit but destroys habitat over wide areas; subsurface mining disturbs less surface but is more dangerous and expensive.
Acid mine drainage and tailings
Other impacts and reclamation
Why this matters
Mining is a major land-use disturbance that links to soil and water degradation (Unit 4), to the tragedy of the commons where impacts are externalised, and to the energy resources of Unit 6 (coal mining). Its impacts and reclamation requirements are a recurring AP example of weighing resource extraction against environmental cost.
Try this
Q1. Identify the leftover crushed waste rock from mining that can leach toxic metals. [1 point]
- Cue. Tailings.
Q2. Explain how acid mine drainage harms a stream. [2 points]
- Cue. Exposed sulfide minerals react with water and oxygen to form sulfuric acid, which drains into the stream, lowering its pH and dissolving metals; the acidic, metal-laden water kills fish and other aquatic organisms.
Exam-style practice questions
Practice questions written in the style of College Board exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AP 2021 (style)4 marksSection II (FRQ). (a) Describe the difference between surface mining and subsurface mining. (b) Explain how acid mine drainage forms and harms aquatic ecosystems. (c) Identify one environmental impact of mine tailings. (d) Describe one method used to reduce the long-term impacts of a mine site.Show worked answer →
A 4-point FRQ on mining impacts.
(a) Describe (1 point): surface mining removes soil and rock (overburden) to reach near-surface deposits (strip, open-pit, mountaintop removal); subsurface mining digs tunnels or shafts to reach deep deposits.
(b) Explain (1 point): exposed sulfide minerals react with water and oxygen to form sulfuric acid; this acidic, metal-laden water (acid mine drainage) runs into streams, lowering pH and killing aquatic life.
(c) Identify (1 point): tailings (leftover crushed waste rock, often with toxic metals or chemicals) can leach into soil and water, contaminating them, and tailings dams can fail.
(d) Describe (1 point): reclamation, restoring the site by replacing soil and replanting vegetation; capturing and treating drainage; or lining tailings ponds.
Markers reward the overburden-removal versus tunnelling contrast, sulfuric acid formation for acid mine drainage, toxic leaching for tailings, and a valid reclamation or treatment method.
AP 2018 (style)1 marksSection I (multiple choice). Acid mine drainage is most directly caused by: (A) the burning of coal in power plants (B) sulfide minerals reacting with water and oxygen (C) fertilizer runoff from farms (D) thermal pollution from cooling water. Justify your choice.Show worked answer →
A 1-point MCQ on mining. The answer is (B).
Acid mine drainage forms when sulfide minerals exposed by mining react with water and oxygen to produce sulfuric acid, which then carries dissolved metals into waterways. (A) causes air pollution and acid rain, not mine drainage; (C) causes eutrophication; (D) is heat pollution. The trap is confusing acid mine drainage with acid rain; acid mine drainage comes from exposed sulfide minerals at mine sites.
Related dot points
- Topic 5.2 Clearcutting: describe clearcutting and explain its environmental consequences for soil, water and ecosystems.
A focused answer to APES Topic 5.2, covering clearcutting as a logging method, its economic appeal, and its consequences for soil erosion, water temperature and quality, flooding, habitat loss and biodiversity, with a worked erosion comparison.
- Topic 5.10 Urbanization: explain the environmental effects of urbanization, including impervious surfaces, runoff, the urban heat island, sprawl and saltwater intrusion.
A focused answer to APES Topic 5.10, covering urbanization, impervious surfaces and increased runoff, the urban heat island effect, urban sprawl, depletion and saltwater intrusion, and the benefits of smart growth, with a worked impervious-surface calculation.
- Topic 5.1 The Tragedy of the Commons: explain how shared, unregulated resources tend to be overexploited, and describe solutions such as regulation and privatisation.
A focused answer to APES Topic 5.1, covering the tragedy of the commons, why individual self-interest depletes shared resources, examples (fisheries, grazing land, the atmosphere), and solutions such as regulation, privatisation and cooperation, with a worked grazing example.
- Topic 5.13 Methods to Reduce Urban Runoff: describe methods such as permeable pavement, rain gardens, green roofs and retention ponds that reduce urban stormwater runoff.
A focused answer to APES Topic 5.13, covering methods to reduce urban stormwater runoff (permeable pavement, rain gardens, green roofs, retention ponds, planting trees), how each restores infiltration and filters pollutants, and their benefits, with a worked runoff-reduction calculation.
- Topic 4.2 Soil Formation and Erosion: explain how soil forms from weathered rock and organic matter, describe the soil horizons, and explain the causes and effects of soil erosion.
A focused answer to APES Topic 4.2, covering weathering, the five soil-forming factors, the soil horizons (O, A, B, C, R), the causes and consequences of soil erosion, and conservation, with a worked soil-loss calculation.
Sources & how we know this
- AP Environmental Science Course and Exam Description — College Board (2020)