Western Sahara but realistically it’s all morroco. They have largest reserves now and at the price to mine 4500m deep underground, it would turn a lot of resources in morroco to reserves.

I did feas work on a project in Tunisia a decade ago that was quite substantial but economics marginal and couldn’t get it over the line due to then prices of phosphorous and the ability of morroco to just ramp up production (actually should probably dust it off). There are lots of resources like this that would become economical faster. Supply/demand and all that.

That said the initial ore body may be great and 50 years from now who is to say