Nickel
Sorting and dumping the waste rock at the shaft will considerably reduce transportation cost of the upgraded nickel ore to the distant processing plant. In many instances, mineral reserves that were previously uneconomic are now viable projects, which extend the life of the mine.
Nickel ore samples tested from a Sudbury Basin nickel mine have shown that 30 per cent of the Run of Mine material was waste rock, and could be ejected using the XRT sorting process. The remaining nickel was upgraded significantly.
The optical TOMRA Sorting Solutions system together with a magnetic sensor makes use of the combination effect of color and metallic properties to separate the concentrate from contaminants. From observation of the runs, the material can be sorted with little loss of valuable mineral depending on the operating conditions. The objective was to obtain maximum concentrate recovery with small to moderate dilution.
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