Cambridge O-Level Environmental Management: Rocks and Minerals and Their Exploitation (5014)

This guide covers Topic 1 Rocks and Minerals and Their Exploitation, the first of nine topics in Cambridge O Level Environmental Management (5014), for examination 2025-2026. The syllabus shares content with sibling Cambridge IGCSE Environmental Management (0680) – textbooks endorsed for 0680 are suitable for use with this O Level too, though this qualification retains an older nine-topic structure rather than 0680’s more recent seven-topic version.

Where this fits in 5014

Topic 1 opens the syllabus with the formation and human use of rocks and minerals, before the course moves through Energy and the environment, Agriculture and the environment, Water and its management, Oceans and fisheries, Managing natural hazards, The atmosphere and human activities, Human population, and Natural ecosystems and human activities.

Syllabus coverage

CAMBRIDGE O LEVEL ENVIRONMENTAL MANAGEMENT (5014) — TOPIC 1 ROCKS AND MINERALS AND THEIR EXPLOITATION

• 1.1 Formation of rocks — the rock cycle, and the formation and characteristics of named igneous, sedimentary and metamorphic rocks
• 1.2 Extraction of rocks and minerals from the Earth — surface and subsurface mining methods, and the factors affecting extraction decisions
• 1.3 Impact of rock and mineral extraction — the environmental, economic and social impacts of extraction
• 1.4 Managing the impact of rock and mineral extraction — strategies for restoring and repurposing landscapes damaged by extraction
• 1.5 Sustainable use of rocks and minerals — approaches to using these resources sustainably

How to approach it

Because this topic traces one continuous story – how rocks form, how they are extracted, what that costs the environment, and how the damage is managed and made sustainable – revise the five sub-topics in that order rather than as isolated facts, since exam questions often connect extraction method to its specific impacts and management strategies. Named case studies are not prescribed by the syllabus, so check which specific examples (particular mines or extraction sites) your course has used and make sure you can apply the general concepts to them. Questions on managing extraction impact often ask candidates to evaluate the benefits and limitations of specific restoration strategies, so practise weighing strategies against each other rather than describing them individually.

Official syllabus

Cambridge O Level Environmental Management (5014) syllabus for 2025 and 2026 — cambridgeinternational.org.

The three rock types

Type	How it forms	Examples
Igneous	Magma from the mantle cools and solidifies	granite, basalt
Sedimentary	Eroded particles settle in layers and are compressed	sandstone, limestone, shale
Metamorphic	Existing rock altered by heat and pressure	marble (from limestone), slate (from clay)

Igneous rocks are “formed by fire” and are associated with volcanic activity; those cooling slowly at depth form large crystals, those cooling quickly at the surface form small ones.

Sedimentary rocks accumulate on sea beds where the weight of overlying sediment compresses the layers below. Their layered structure is diagnostic, and they alone contain fossils.

Metamorphic rocks form where rock meets new magma flows or lies along plate boundaries, where stress accompanies great earth movements.

Minerals and reserves

A mineral is a substance obtained by mining. Some, such as iron and bauxite, are abundant in crustal rock; others, such as gold, tin and copper, are rare in ordinary rock and occur only in concentrated deposits.

A reserve is a known deposit that has not yet been mined and could be extracted in future. Reserve figures are estimates, and they change — upwards when new deposits are discovered or when higher prices make lower-grade ore worth working, downwards as extraction proceeds. A resource becomes a reserve only when extraction is economically viable, which is why “how long will supplies last” questions cannot be answered by division alone.

Methods of extraction

• Open-cast (surface) mining — used where the mineral lies close to the surface or the seam is exposed. Cheapest and safest, but removes vegetation and topsoil over a wide area.
• Adit mining — a near-horizontal passage driven into a hillside to reach a seam. Limited to deposits exposed on a slope.
• Deep (shaft) mining — vertical shafts sunk to reach deep seams. Expensive and hazardous, with risks of collapse, flooding, gas and dust-related disease, but the surface footprint is small.

Exploration precedes all of these: geological surveys, remote sensing and test drilling establish whether a deposit is worth working.

Environmental impacts and management

Extraction causes land degradation and loss of habitat, spoil heaps, subsidence over deep workings, dust and noise, and water pollution from acid mine drainage and from tailings ponds. Processing adds air pollution and high energy demand.

Management strategies include restoring landforms and replanting after extraction, treating waste water before discharge, controlling dust by spraying, using efficient technology to reduce waste, monitoring by legislation and licensing, and — most durably — recycling metals, which reduces both new extraction and the energy used in smelting.

Worked example

A country reports iron ore reserves of 400 million tonnes and extracts 8 million tonnes a year. Explain why “reserves will last 50 years” is unreliable.

400 / 8 = 50 years, but this assumes:
  - extraction rate stays constant (demand usually grows)
  - no new deposits are discovered (exploration continues)
  - the economic threshold is fixed (higher prices make low-grade ore viable)
  - no substitution or recycling reduces demand

The calculation is worth one mark; the reasons it is unreliable are worth the rest.

Common mistakes

Saying metamorphic rocks are “melted” — they are altered in the solid state, since melting would make them igneous. Treating resources and reserves as the same thing. Claiming open-cast mining has no environmental impact because it is at the surface. Listing impacts without matching management strategies when the question asks for both. Answering a lifespan calculation without evaluating its assumptions.

Quick revision checklist

• Describe how each of the three rock types forms and name examples.
• Distinguish a resource from a reserve and explain why reserve estimates change.
• Compare open-cast, adit and deep mining, with advantages and disadvantages of each.
• Describe the environmental impacts of extraction and processing.
• Match each impact to a realistic management strategy.
• Evaluate the assumptions behind any “how long will it last” calculation.