What are the advantages of using biological methods, such as phytomining and bioleaching, for metal extraction compared to traditional mining methods?

Biological methods like phytomining and bioleaching are more environmentally friendly as they reduce the need for large-scale excavation and minimize habitat destruction. Additionally, these methods can extract metals from low-grade ores, making them more sustainable as high-grade ores become scarce.

A strong answer should directly address the approved learning objective to evaluate biological methods of metal extraction from information provided. (HT only). This question belongs to Alternative methods of extracting metals within Using the Earth's resources and obtaining potable water, so the response should use that exact curriculum context rather than a generic statement. The answer is correct when it names the key idea, explains the link to HT only, and keeps the wording specific to AQA GCSE revision.