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In Froth floatation, the principle is the organic chemicals in the gold which causes it to float when disturbed by air in a tank.
When gold is separated, there is also a bi-product or waste. The waste that comes from the mining of the gold is often used as land fill. This is after further minerals are extracted from the gangue. Waste products are also found in the froth flotation process. Here, the wet gangue is taken to a dam, usually lined with cement, called a tailings dam. The water is allowed to evaporate and the solid waste (tailings) is disposed of. It must however be disposed of safely as it may contain small amounts of toxic lead and zinc...
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