Could be that there's various likely pathways to improve PFS numbers, but each pathway needs evidence to support it.
Plus the funders/partners requiring more evidence of sorters being proven to work.
But a bit of 'random' mixed in there with the focus on antimony, for grants / mining / byproducts.
I'm interested in this (red):
Looks to me like heap leach can take: low grade ore from the screener, low grade rejects from the sorter.
Before adding the proposed heap leach, the sorters were fed low/medium/high grade. Now only fed medium/high grade. Sounds good - cutting down on the number of sorters needed (by half?), replacing them with a low cost heap leach (which also replaces the waste dump with a new revenue source).
It looks like heap leach would even share some of the regular plant (Adsorption onwards). So heap leach only needing: agglomeration, leaching piles.
So heap leach could be interesting, cutting down on the CAPEX spent on sorters.
There are some questions though - like can sorters be improved above simple X-ray sorting (lasers etc is complicated)? What is the cost of CM Extraction Plant? How many of these ideas are realistic?
PFS would work it out though, even if only half of them were realistic.
But need some upgrading of resources before then. We don't even have an antimony resource/byproduct to use for calculations - so how could PFS progress, with a prospective CM Extraction plant.
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Could be that there's various likely pathways to improve PFS...
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