LRS General Discussion, page-18693

Lithium Ionic used higher prices in their DFS only released last month.

A LOM price of $1375/t would be reasonable in the DFS, as it's still consistent with long term forecasting from agencies (into the 2030s).
Had that been used in the PEA, it would've taken the NPV down from $2.5b to $1.75b (USD).

The life of mine used was 11 years in the PEA.

They need about 41,000t of lithia per year to put out 500kt at 5.5% spodumene at a 67% recovery rate.
The measured and indicated resource has 850kt of lithia.

Though there may be some pit design quirks that prevent it all being used, I expect a 15 year LOM at the very least, which will boost the NPV.