Keen eye SN.
The 5-10M oz is not a factual number at all.
It is a number that has come from informal discussions with the geologists that has made it's way onto this hub and our discussions. They do not endorse this number.
Take it with a large grain of salt indeed. However I am not bound by 43-101, or any other governing body so I threw it out there. But certainly, it should be duly noted and great question.
B