RE:Guesstimation
I like this article, it help to understand this kind of business a little
https://www.baystreet.ca/articles/stockstowatch.aspx?articleid=28153#.WD9XUvyvgEk.twitter
About share price I again don't know what I am doing, but if you can find a junior and look at their PE ratio, you will properly have a good indication. However maybe rather look in a sector using similar plant technology? The reason I mention that is, other juniors in this sector uses batch technology (12-24 months) hence no income the first two years, and then from there income, 1-2 times a year, with PE.V their would be continuous production of income from plant completion, it properly takes1,5 years to build, so I believe you would see a better cash flow performance.