I find that PEA interesting on a couple of points:

1. $1,600 Gold price as Sibu pointed out.

2. The post tax NPV of $328 million is 37.5% of their $123 market cap.  That is, after their 12% drop in share price today.   our VD, post tax NPV is $644 million US ($836 Million Cdn).  If our share price was 37.5% of $836 million - then we should around $0.63/share  ($836 X .375 / 500 million shares). And we haven't even included SC yet.

3. They used 5% discount factor.   VD used 7.5% discount.   Being able to use a 5% discount would be quite a bit better. 
MoneyK recently calculated that SC NPV would be $4.7 Billion Cdn based on Copper 3.15, Gold $1300, Silver $17.50, Moly $10.00 using a 8% discount.   
If we could use a 5% discount then the NPV would jump to $7.5 Billion Cdn. Quite the jump.

Interestingly - using gold @ $1,600 doesn't change the NPV too much - $7.8 billion cdn

4. Annual gold production of 102,000 ounces for 9 years. 
SC will produce 236,000 ounces for the first 7 years and then 170,500 ouncers for the next 14 years.  And this isn't even considered a Gold mine.