Examples of mining rates

Risks aside, If this EMA REE prospect does progress through development and in to operation, I've been contemplating an early revenue projection model (a range) for the mine.

With this low effort / open pit approach - what sort of potential capacity do we see being mined per year? Are there some examples out there of the quantity / volume of clay that can be mined and processed per year?

I understand this depends on the capital they have to spend, and likely would require some ramp up over years, however I am just thinking about the potential end state here.