If this were to happen the stock price would go up towards the 20x EPS (or a number that reflects minelife) (incentive to sell at this price vs slightly more money holding it over the years, as no one would sell for 5x EPS when you could get that by waiting 5 years and continue recieving after) and then each year go down as year after year there would be less potential earnings coming in as the mine life continues on. 

Although on the other hand I dont see this happening.