One or more of 120 air ejectors are

One or more of 120 air ejectors are fired
to divert the value or waste past a cutter and into
the accept/reject bins. As the position of the rock is
accurately identified, and the ejector firing duration
is less than 1 ms, the sorter can operate very selectively.
A range of lasers of different wavelengths
can be used, from ultraviolet to infrared, to achieve
optimum discrimination.