Phytomining is one alternative method for extracting copper from low-grade ores. Which statement correctly describes how phytomining works?

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Question

Phytomining is one alternative method for extracting copper from low-grade ores. Which statement correctly describes how phytomining works?

Accepted Answer

B. Plants absorb copper ions through their roots; the plants are burned and copper is recovered from the ash — In phytomining, hyperaccumulator plants grow on low-grade copper land, absorbing copper ions through their roots and concentrating them in their tissues. The plants are then harvested and burned; the ash (bio-ore) is processed to recover the copper. Option A describes bioleaching. Option C describes electrolytic purification/extraction. Option D describes displacement, which is used after bioleaching to recover copper from leachate, not phytomining itself.

Answer

B. Plants absorb copper ions through their roots; the plants are burned and copper is recovered from the ash

Answer

D. Scrap iron displaces copper from a copper-rich leachate solution

Answer

A. Bacteria oxidise copper sulfide ores and release copper ions into solution

Answer

C. Copper ore is dissolved in acid and copper is deposited by electrolysis

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