Some rough numbers:
Proven Resource 300,000,000 (maiden JORC)
Annual Capacity 8,000,000
Life of Mine 37.5 years (remember open in all directions so strong likelyhood of Proven Resource increase - 50yrs? 75 yrs? 100 yrs?)
Sales
8m x $500tn = $4 Billion p/y
http://www.bloomberg.com/news/2011-03-16/uralkali-says-potash-will-surge-as-market-similar-to-record-year.html
Might hold for maiden dividend...