high quality gold mining
Aug 05, 2019 The World Gold Council defines a high-quality underground mine as having a gold ore density between 8 and 10 g/t (grams per ton), while a low-quality underground mine has a gold ore density of 1 to 4 g/t. Some view Bonanza-grade as more than 34 grams of gold per tonne or more than one troy ounce of gold per ton
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