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 the outgoing 2025-2026 edition of Cambridge O Level Environmental Management (5014). The syllabus shares content with sibling Cambridge IGCSE Environmental Management (0680) – textbooks endorsed for 0680 are suitable for use with this O Level too.

Which edition this guide covers: 5014 currently has two live editions. This guide follows the outgoing 2025-2026 syllabus (version 2), which keeps the older nine-topic structure and is available for its final sitting in only one administrative territory (Mauritius, in the November series) – check with your centre whether you are on this edition or the newer one. A 2027-2029 edition of 5014 has already been published and restructures the subject into seven topics, matching 0680’s current structure exactly (energy becomes three sub-topics within a Natural Resources topic rather than its own topic, rocks content is renumbered, and an “ore” definition and a third extraction method – biological extraction – are added). If your course has moved to that edition, this guide’s topic numbering and some content below will not match your syllabus; use the 2027-2029 Rocks, Ores and Minerals guide instead.

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	Cooling and solidification of magma or lava	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 shale)

Igneous rocks are “formed by fire” and are associated with volcanic activity; those cooling slowly at depth (such as granite, which forms within continental crust rather than directly from mantle melt) form large crystals, those cooling quickly at the surface (such as basalt, which is mantle-derived) 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 fossils are common in them. Fossils are usually destroyed by the heat and pressure of metamorphism, though low-grade metamorphic rocks such as slate can rarely preserve them, typically flattened or distorted by cleavage; igneous rocks, forming from melt, do not 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 naturally occurring solid with a definite chemical composition and an ordered crystalline structure. Quartz and feldspar are common minerals found in many rocks; haematite (mined for iron) and cassiterite (mined for tin) are examples of minerals worked for the metal they contain. Iron itself is a chemical element, not a mineral, and bauxite, mined for aluminium, is a rock made up of several aluminium-bearing minerals rather than a single mineral. The metals also differ in how common they are: iron and aluminium are among the most abundant elements in the Earth’s crust, whereas tin, copper and gold are scarce and are worth mining only where they are concentrated.

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.
• 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.

Aside: adit mining — a near-horizontal passage driven into a hillside to reach a seam exposed on a slope — is a real-world variant of surface/subsurface extraction worth knowing about, but it is not one of the two extraction categories (surface mining, subsurface mining) this syllabus names, so do not present it as a required third method or expect it to carry its own exam tariff.

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 (surface) and deep (shaft) 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.