It doesn't say that the life of the mine will be 25 years. I know some will see this as splitting hairs, but if you read what the article says it actually doesn't implicity state what the life of the mine "IS".
A feasibility study (FS) has indicated that Allana’s mine will have the potential to produce approximately one million tonnes of potash annually over 25 years commencing in a few years. (Emphasis mine)
I'm not pointing this out to be a pain, just for clarity. Indicating potential is materially different from stating fact.