Well it states that the 1st 6 years are for 22.5k toz & the remaining is 6% of production at 20% of prevailing spot price. Its a 40 year agreement so that leaves 34 years, sorry not 36. I assume the mine life is the 6 years so they will only have to pay the 6% if they find more economic gold & can afford to actually produce it & give away 6% at 20% of POG.