Quote:
Originally Posted by AlexanderHowl
a typical rich vein in planetary mines has 5 ppm),
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The World Gold Council defines "high grade" ore as 8+ g/t (ppm), while "low grade" ore is 1-4 g/t. Open pit mines have lower standards (perhaps a tenth as high). 5 g/t wouldn't be considered especially "rich", but merely average. The highest grade underground mine in operation is 44.1 g/t, with a couple of runner-ups over 20 g/t, and the top ten all clocking in at over 11.