Can plants be harvested like crops to mine valuable metals from the earth?
In short: While heavy metals like nickel and zinc are typically toxic to life, certain rare plants have evolved to thrive in their presence. These hyperaccumulators store high concentrations of minerals in their leaves and sap, offering a potential new way to stabilize mine waste and extract precious resources.
Hyperaccumulators are specialized plants that have adapted to survive in environments with high concentrations of otherwise toxic elements. Dr. Antony van der Ent of the University of Queensland is currently researching how these plants manage to store heavy metals in their shoots and leaves. This unique biological mechanism makes them incredibly rare, as they often grow only on specific mineral outcrops, a phenomenon that can make them hyperendemic to a single site.
The concentration of metals within these plants can be staggering. In New Caledonia, the tree Pycnandra acuminata contains up to 25% nickel in its blue-green latex, a level of metallic content that Dr. van der Ent describes as perhaps the most extreme in the known world. Similarly, the Borneo-based Phyllanthus balgooyi can contain 20% nickel in its sap. In Australia, other species have evolved to target different elements: Neptunia amplexicaulis accumulates selenium, Gossia fragrantissima targets manganese and cobalt, and Crotalaria novae-hollandiae focuses on zinc.
This biological trait opens the door to a process called phytomining, where these perennial 'metal crops' are grown on mine tailings to extract residual minerals. Beyond mining, researchers hope to use these plants to remediate contaminated environments. For instance, species like Gastrolobium parviflorum and Gastrolobium parvifolium, which produce the compound fluoroacetate used in 1080 poison, could potentially be used to extract poisonous fluoride from industrial wastewater, such as that produced by coal mining. However, identifying these species is a race against time before mining operations claim their specific habitats.
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- Summary by Intellect · source: Meet the hyperaccumulators: plants that can mine metals
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