That's a can of worms I don't want to re-open here. For your own due diligence you can check out a very recent analysis of transactions from a junior copper resource company( I don't have any shares):

https://www.copperbankcorp.com/_resources/presentations/CopperBank-Corporate-Presentation-February-2021.pdf 

Slide 6 has some interesting info. The price per share I used previously was based on a similar analysis I tracked down by Canaccord years ago. There are many variables that go into determining a price but, as a reminder to those posting values based on NPV, companies are paying for copper in the ground not NPV. So you should normalize the numbers based on the amount of copper. Vette didn't understand this when he kept posting values for Quellaveco so his numbers had no bearing in determining a value for SC. That slide shows examples of properties that were sold for very little value even with large resource numbers, such as Taseko taking out Yellowhead. If a project doesn't have a path to development then it's not worth much. I don't know if Van Dyke has removed the surface access problem for the pilot test or if Teck will be accomodating should CF find a buyer for SC. We're going to find out this year.