Alternative methods of extracting metals (HT only): The Earth’s resources of metal ores are limited.

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Q: Is this Alternative methods of extracting metals (HT only): The Earth’s resources of metal ores are limited. guide aligned to the AQA specification?

Yes. This guide is linked to the Alternative methods of extracting metals (HT only): The Earth’s resources of metal ores are limited. topic in the AQA GCSE specification.

Metal ores are finite resources: the amount of metal in the Earth’s crust is fixed, and once extracted it is not replaced on a human timescale.

Study notes

From the checked teaching notes for this specification point.

The idea

What earns the marks

States that metal ores are finite or non-renewable resources found in the Earth’s crust.
Explains that the total amount of each metal in the Earth is fixed, so extraction reduces the accessible reserves.
Links limited ore supplies to rising demand for metals and the increasing difficulty and cost of extracting lower-grade ores.
Explains that recycling conserves metal ores and can reduce the energy used and waste produced compared with extraction.
Describes alternative methods such as phytomining and bioleaching as ways to extract metals from low-grade ores or contaminated land.
Uses the idea of sustainable development to justify conserving metal resources for future generations.

Common mistakes and how to put them right

Saying metals will run out completely and immediately.
Put it right: Ores are limited and reserves are being depleted, but the timescale is uncertain and depends on demand and technology.
Confusing finite with renewable.
Put it right: Metal ores are finite because they form over geological timescales, far slower than human use.
Thinking recycling is only about litter.
Put it right: Recycling metals conserves ore reserves and often saves energy compared with extraction from ore.

Exam tips

Use the phrase finite resource and link it to the fixed amount of metal in the Earth’s crust.
Give a named consequence of limited ores, such as increased cost of extracting low-grade ores or greater reliance on recycling.
When discussing alternatives, name phytomining or bioleaching and state one advantage, such as using low-grade ore.
Note that alternative methods of extracting metals (phytomining and bioleaching) are assessed at Higher Tier only.

Try the lesson

The start of the Alternative methods of extracting metals (HT only): The Earth’s resources of metal ores are limited. lesson, made from checked teaching notes for this specification point.

Have a go first

Which statement best describes the supply of metal ores found in the Earth's crust?

Tip: press 1 to 4 to choose

Listen

Metal ores are finite resources: the amount of metal in the Earth’s crust is fixed, and once extracted it is not replaced on a human timescale. Ores are concentrated enough to be worth extracting, but high-grade ores are being depleted as demand rises. Metals are essential for construction, electronics and transport. Limited availability, alongside the energy and environmental costs of extraction, encourages recycling and alternative extraction methods like phytomining and bioleaching (assessed at Higher Tier only). Recycling conserves ore, reduces waste and often uses less energy than extracting metal from its ore. A strong answer earns marks for these points. States that metal ores are finite or non-renewable resources found in the Earth’s crust. Explains that the total amount of each metal in the Earth is fixed, so extraction reduces the accessible reserves. Links limited ore supplies to rising demand for metals and the increasing difficulty and cost of extracting lower-grade ores. Explains that recycling conserves metal ores and can reduce the energy used and waste produced compared with extraction. A common slip: Saying metals will run out completely and immediately. Instead, ores are limited and reserves are being depleted, but the timescale is uncertain and depends on demand and technology. Exam tip: Use the phrase finite resource and link it to the fixed amount of metal in the Earth’s crust.

See it

A top-down flowchart. The first box reads 'Metal ores in the Earth's crust' and points to 'Amount of metal is fixed', which points to 'Ores are limited (finite)'. From 'Ores are limited (finite)' three branches lead out. The first branch goes to 'Extraction reduces accessible reserves', then to 'High-grade ores being depleted as demand rises', then to 'Lower-grade ores harder and more costly to extract'. The second branch goes to 'Recycling conserves ore', then to 'Reduces waste and often uses less energy'. The third branch goes to 'Alternative methods: phytomining and bioleaching', then to 'Extract metals from low-grade ores or contaminated land'. — It shows how the fixed amount of metal in the Earth's crust makes ores a limited resource, and how recycling and alternative extraction methods help conserve them.

Label the diagram

Some boxes have lost their names. Pick the right name for each number.

The diagram again, with 3 boxes numbered instead of named. A top-down flowchart. The first box reads 'Metal ores in the Earth's crust' and points to 'Amount of metal is fixed', which points to 'Ores are limited (finite)'. From 'Ores are limited (finite)' three branches lead out. The first branch goes to 'Extraction reduces accessible reserves', then to 'High-grade ores being depleted as demand rises', then to 'Lower-grade ores harder and more costly to extract'. The second branch goes to 'Recycling conserves ore', then to 'Reduces waste and often uses less energy'. The third branch goes to 'Alternative methods: phytomining and bioleaching', then to 'Extract metals from low-grade ores or contaminated land'.

1Box 1
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3Box 3

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