silver grade upgrade & free carry of gold

IDC current JORC from 2011 indicates a silver resource of 20 million @ 22gt. Does anyone care to extrapolate on the impact of drilling results thus far on grade?

Furthermore, has anyone done the metrics on how many ounces and grade silver production would infer that gold at Mt Kare could be done at $0 cost?

I ask because I was going over IDC announcements again and see 275 samples with over 100gt have been identified as a consequence of the bonanza drilling campaign, including hits between 400 - 1500gt (as per ann released 10/1/13).