Commissioner, Guyana Geology and Mines Commission
2020-7-2u2002·u2002Guyana. The best deposits are found in Bon Millee on an old terrace of the left bank of the Ireng River in the North Rupununi savannahs, approximately 31 miles north of Lethem. Likewise in a gravel bed deposit at Sishwa, 4 miles down the Ireng River from Bon Millee.
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