RE:They call it Doctor Copper (PhD)I'll go with Cormack thank you very much. Never liked Kaiser. He talks about grades at different levels and comparing them with other porphyry deposits. EVERY deposit is different. Besides, with the different erosion levels in the mountains of British Columbia, you never know which part of the porphyry intrusion has been eroded off, so I wouldn't read too much in what Kaiser is saying.