Bioleaching: Involves bacteria., Some organisms involved use chemosynthesis to produce sugars., A liquid packed with suitable micro-organisms is sprinkled on piles of ore dust., This method takes a long time – up to two years., The process is made more efficient by controlling conditions such as pH, temperature and humidity., Extracts metals from low grade ore., Phytomining: Involves plants., Organisms involved use photosynthesis to make sugars., Use active transport to move metal ions from soil into roots., The plants are grown in soil rich in metal compounds., This method has a low yield., The process is made more efficient by using quick growing, high biomass species which are proficient at accumulating metal compounds in their tissues., Extracts metals from low grade ores., Electrolysis is needed to obtain the pure metal,

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