Ann: Resource and Reserve Boost Adds Years to Lithium Project, page-20

I'm seeing 12-year mine life mentioned here, but what I read in the announcement is that it's a 15-year mine life that was one thing they based the spodumene revenue factors on.

I also see they assume that "mining may take place on the adjacent Pilbara Minerals tenement to the east to facilitate accessing of deeper Ore Reserves on the Altura tenement".  And "The mining on the Pilbara Minerals side of the tenement boundary has been dealt with on a conservative basis in the estimation of these Ore Reserves, in that all mining costs are assumed to be paid by Altura. Furthermore, no economic value has been allocated to potential Ore Reserves on the Pilbara Minerals tenement, which are therefore also excluded from the reporting of the Ore Reserves."

So, maybe the mine life could end up being longer than 15 years.