Very difficult to guess future prices at 6 years, but assuming the mine is producing at full capability at $1500/oz, and the (conservative) PEA is accurate, they would be bringing in about 180million a year in profit. That, over say 6 years (not including any change in gold price) is 1.1 billion dollars in earnings(conservatively). That's just a lot of money to spend on exploration and development. So would likely have a pretty good size dividend, especially if we take on debt for future exploration/development.
That being said, based on the cash the company would generate and my other assumptions not stated here, with no futher dilution, i could see the market cap of RBY easily being $4 billion in 5 years. That would meant a share price of around $13.88 a share, with a reasonable P/E ratio of 14.8. That ratio is around a median level for gold stocks but could easily go as high as 20, which would mean a market cap of 5.75 billion and a share price of about $21.
there are many assumptions here. If there is anything glaringly wrong, i'd appreciate constructive criticism and corrections, but i think this is reasonable math.
It is wrong to use “cash cost” to calculate profits (aka GAAP earnings). If company produces 180 KOz/year then profit cannot be $180M (at current gold price). Realistic number would be about twice less.
Please note that I make this reply exclusively because you requested “constructive criticism and corrections”. You can check "all-in" costs reported by many companies now. The numbers are much higher than “cash cost” and much closer to truth.