actually you can come up with a number of oz.... can be done by using info from each drill hole and extrapolating a number of feet around each zone that carries gold... add it all up and you get the number of oz.... its rough but in its own way is quite accurate.... this is what is done when a 43-101 is done but the drilling is much closer together and gives a better picture of a "zone" ... nevertheless I will bet more than one person has already done a calculation the way I have said.... in fact I think people have done it right here so I am not saying anything new......