"What concerns me about this graph is that based roughly on grade and deposit size, then it might suggest CUU is already fairly valued when compared to CUM and III and their respective market caps."

One big difference between CUU's SC and CUM is the production costs. According to Sweet Crystal's post, Canacord estimated that CUM's per lb. copper production costs, net of the precious metal credits, as $3.25. So far, the data from the PFS and Bank of Montreal's (?) estimate, CUU has a negative production cost. Whether it's negative and how negative we will soon find out with the release of the BFS, but my guess is that it would be lower, maybe significantly lower, than CUM's $3.25 a lb. and that changes the economics completely and makes CUU worth more. JMO