Why is bioleaching considered a more sustainable method of metal extraction compared to traditional mining?

Bioleaching is considered more sustainable because it reduces the environmental impact associated with traditional mining, such as habitat destruction and pollution. It also allows for the extraction of metals from low-grade ores, which are not economically viable to mine using conventional methods.

A strong answer should directly address the approved learning objective to describe bioleaching as using bacteria to produce leachate solutions containing metal compounds. (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.