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Classifying Valuable Minerals and Rocks

The mining industry was an early pioneer in sorting technology development, and for centuries it led to the improvement of mechanically assisted sorting of valuable ores from waste rock. A classic example is panning for gold by washing riverbed deposits.

Challenge: Calcite Extraction from Rock Ore

The mineral extraction of Calcite from rock ore is often hampered by the natural occurrence of Chalk in the same ore. The high variability in rock ore composition and size requires a precise chemical mapping of each stone, whether large or small, in order to improve the extraction yield.

Solution: Chemical mapping with
EVK Hyperspectral Imaging

Sorting machines based on our camera technology can accurately sort down to very small sizes with user settable weightings for each mineral present. This allows the production yield of Calcite to be carefully controlled and ensures that the yield is not dependent on rock ore sizes.


Hyperspectral Imaging offers the degree of classification accuracy required for applications in the mining industry by directly measuring chemical molecular composition through the absorption of light (spectroscopy).

EVK’s portfolio of sensor-based technology includes hyperspectral cameras and inductive sensor systems that can be used individually or combined with a color camera with sensor fusion to create a high-performance sorting application.

More Info at
our Technology Center

Other applications in the industry

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