I saw a post about this on reddit the other day. The general impression I got from the comments was the 90% figure was derived from 90% of samples taken had some amount of gold in them.
So totally misleading statistic, even though it's a very rich deposit.
It reminds me of the situation in Zimbabwe 10-15 years ago after (one of the times) Mugabe and Gono destroyed the economy. People were digging up streambanks to find gold so they could buy bread.
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