Ann: Strategic Acquisition of Zinc-Silver-Lead Project, page-85

Some background on value of ore sorting.
http://www.crcore.org.au/images/GradeEngineeringSW.pdf

CONCLUSIONS
The concept of using coarse separation or
‘beneficiation’ to improve feed grades and capital
intensity in the mine to mill ‘dig and deliver’ interface
is not new but requires next generation innovation
and disruptive thinking to become a routine industry
approach.
Grade Engineering® is an emerging integrated
approach to coarse rejection that matches a suite of
separation technologies to ore specific
characteristics and compares the net value of
rejecting low value components in current feed
streams to existing mine plans as part of a systemview. It has been designed in collaboration with a
consortium of miners, METS and research
associations to counter over reliance on throughput
which became the dominant operating culture during
the Millennium Super-Cycle of commodity pricing.
This contributed to a decline in productivity and
return on investment which challenges the minerals
industry in the current price cycle. Grade
Engineering® represents a return to feed Quality in
combination with feed Quantity as primary drivers of
operational excellence focused on the value-chain,