Wednesday, April 14, 2010 11:50:53 AM
They found 34 ppm Au in one of the samples...way beyond economical (".5 ppm can be economical")...the south side could have even higher concentrations!
Per http://en.wikipedia.org/wiki/Gold
[edit] Production
Main articles: Gold prospecting, Gold mining, and Gold extraction
World gold production trend
Ore grades as little as 0.5 g/1000 kg (0.5 parts per million, ppm) can be economical. Typical ore grades in open-pit mines are 1–5 g/1000 kg (1–5 ppm); ore grades in underground or hard rock mines are usually at least 3 g/1000 kg (3 ppm). Because ore grades of 30 g/1000 kg (30 ppm) are usually needed before gold is visible to the naked eye, in most gold mines the gold is invisible.
Per http://en.wikipedia.org/wiki/Gold
[edit] Production
Main articles: Gold prospecting, Gold mining, and Gold extraction
World gold production trend
Ore grades as little as 0.5 g/1000 kg (0.5 parts per million, ppm) can be economical. Typical ore grades in open-pit mines are 1–5 g/1000 kg (1–5 ppm); ore grades in underground or hard rock mines are usually at least 3 g/1000 kg (3 ppm). Because ore grades of 30 g/1000 kg (30 ppm) are usually needed before gold is visible to the naked eye, in most gold mines the gold is invisible.
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