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Tuesday, 03/27/2007 4:47:40 PM

Tuesday, March 27, 2007 4:47:40 PM

Post# of 17016
From another board regarding "visible" gold, which they have at the Deer Trail Mine.

Economic gold extraction can be achieved from ore grades as little as 0.5 g/1000 kg (0.5 ppm) on average in large easily mined deposits, 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) on average. Ore grades of 30 g/1000 kg (30 ppm) are usually needed before gold is visible to the naked eye, therefore in most gold mines you will not see any gold.

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