Mine tailings are the finely ground residue from ore extraction. The grain size of the tailings depends on the nature of the ore and the milling process. Size measurements of tailings from four mines in Ontario, Canada, indicated the tailings materials to be predominantly silt and fine to medium sand with lt;10% clay content ...
Tailings are the materials left over after the process of separating the valuable fraction from the uneconomic fraction 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 process at Millsell involves six stages, the first of which is the obviously the mining that produces the tailings. The mines, in upgrading the chromite content of their ore, produce a tailings stream that contains the majority of the PGMs of the ROM chrome ores. It is these chrome ores with elevated levels of PGMs that are treated.
Similarly, tailings dumps arising from the processing of chrome ore in the Lower reefs of the BC are also being retreated to recover PGEs. Several commercially profitable enterprises have also been set up with the sole intention of retreating tailings dumps arising from South Africas Witwatersrand gold processing operations.
Mine tailings include process affected water, containing dissolved metals and ore processing reagents and fine grained ground up rocks after minerals of value have been extracted from mined ore. In tailings pond, the residues are usually deposited as water based slurry before recycle/reuse or discharge to environment.
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