For those of us on the board who are not too well informed on geology, you can go to www.northernminer.com and access their Geology 101 site. The Porphyry deposits sections give some interesting examples of some well known deposits and grade of ore. In Bema's case, Refugio and Cerro Casales are porphyry deposits. The Epithermal deposits sections are quite interesting as well. I noted that the two basic types were large, low grade or small, high grade deposits. From information gathered to date, it seems that Kupol is a large, high grade deposit. This seems to be an anomaly! And it could become an extremely large deposit. Only time will tell.