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In all instances, due consideration must be made to contamination of the underlying water table, amongst other issues.Dewatering is an important part of pond storage, as the tailings are added to the storage facility the water is removed - usually by draining into decant tower structures.Tailing ponds are often somewhat dangerous because they attract wildlife such as waterfowl or caribou as they appear to be a natural pond, but they can be highly toxic and harmful to the health of these animals.Tailings ponds are used to store the waste made from separating minerals from rocks, or the slurry produced from tar sands mining.

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Emergency tailing ponds constructed in response to the 2015 Gold King Mine Spill in Colorado, pictured on August 7, 2015.Making provision for the approximately 77 million tons that is produced annually is one of the most significant problems for the aluminium mining industry.Modern mines, particularly those in jurisdictions with well-developed mining regulations and those operated by responsible mining companies, often include the rehabilitation and proper closure of tailings areas in their costs and activities.Tailings, also called mine dumps, culm dumps, slimes, tails, refuse, leach residue or slickens, terra-cone (terrikon), are the materials left over after the process of separating the valuable fraction from the uneconomic fraction (gangue) of an ore.Tailings are distinct from overburden, which is the waste rock or other material that overlies an ore or mineral body and is displaced during mining without being processed.The water removed can thus be reused in the processing cycle.