Sorry, I should have made it clear that these other mineral possibilities would be in additiona to copper and many of the other metals most often associated with porphyry desposits - lead, zinc, moly, silver and gold (along with lesser credits for some related elements).

The point is, our "treasure chest" may well include a mix of much greater variety than most observers have previously contemplated, especially given that many of these elements arise from more recent studies of such deposits.