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In mining, tailings or tails are the materials left over after the process of separating the valuable fraction from the uneconomic fraction of an ore.Tailings are different 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.
Gold mine tailings near Krugersdorp, South Africa. Tailings stratification is the layering of tailings due to the distribution in particle size as well as the difference in specific density . The compactness of the sandy to silty tailings [ 13 ] influences the permeability, which will influence the drainage ability of the tailings and thus the ...
An orogenic gold deposit is a type of hydrothermal mineral ... 1995 Omai cyanide spill in which the tailings dam of the Canadian owned Omai Gold Mines Ltd failed, ...
Drawbacks of leaching include its lower efficiency and the often significant quantities of waste effluent and tailings produced, which are usually either highly acidic or alkali as well as toxic (e.g. bauxite tailings). There are four types of leaching: [not verified in body] Cyanide leaching (e.g. gold ore) Ammonia leaching (e.g. crushed ore)
The remaining tailings are sent thRough a final thickening stage and are pumped into the tailings pond composed of approximately 85% solids and very little cyanide. Twice a year the excess water is drained off the tailings pond where it flows naturally through a series of polishing ponds and a freshwater marsh.
Gold heap leaching. Heap leaching is an industrial mining process used to extract precious metals, copper, uranium, and other compounds from ore using a series of chemical reactions that absorb specific minerals and re-separate them after their division from other earth materials.
That process isn’t 100% effective, though, so the used ore still containing trace amounts of gold—referred to as “tailings”—is deposited in giant piles scattered around NGM’s complex ...
A gold dredge works by having large buckets that pull the gold-bearing earth up into its machinery to be processed, keeping the gold and spewing the waste (known as "tailings") out the back by way of a stacker. Built on a shallow hull, these dredges did not need a lot of water to operate, as they moved their pond of water with them.