based on an 8:1 PE ratio, which is a good first target, BLK should read 14.5 cents based on their worst case target of 80koz @ 1200AISC.
With a long mine life and reserves, I cannot see why higher than 8 PE is possible but it depends on the market conditions. Currently miners average PE on the ASX is 9.4 so I don't have my hopes set much higher than that, but it's a really nice rise from today.