From memory it was for every 1% increase in recovery would add $1m to the NPV (pretty sure it was in the PFS too). This was before the 45% resource upgrade and the PFS used $250USD/mtu (price is now 325USD/mtu). So i expect that $1m per 1% has increased significantly.
Ann: Santa Comba shows improved recoveries ahead of DFS, page-7
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