With ore assaying around 15 per ton, it required the need to process by volume and necessitated a 30-stamp mill operated by 20 men. The Mammoth Mill was increased to 70 stamps in 1900. Service And Support . Highest-grade gold mines in 2017 MINING.COM. Sep 10, 2018 At 7.6 gt grams of gold per tonne of milled ore, the Way Linggo mine, owned.
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