Phytomining

This is research that has been going on for decades now. See this 1998 Trends in Plant Science paper Phytomining by Robert R Brooks, Michael F Chambers, Larry J Nicks and Brett H Robinson. Also this more recent one Phytomining of gold: A review by V. Sheoran, A. S.Sheoran and P. Poonia.

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This research is based on tiny, tiny samples of the currently existing biodiversity. Countries like Bolivia, Peru, Colombia and Brazil have vast biomes that would almost certainly yield new species of plants that have these hyper accumulator properties. But these countries are being forced to ignore long-term benefits in favour of short-term necessities such as generating foreign exchange income to meet trade deficits. 

See Amalia Pando Entrevista con Héctor Córdova Eguívar and Mineria Sostenible en Peru - La otra cara de la minería aluvial - Puerto Inca, Huánuco. 

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