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500 Years Of Mining In Brail

500 Years Of Mining In Brail

500 years of mining in Brail Declining grades in gold mining after 160 years of exploitation. In the period from 1834 to 1994 St. John Del Rey Mining experienced wide fluctuations in grade in its mines varying from 16.5 g of gold per metric ton at the beginning to 6.5 gton in 1994. The peak 32.3 gton was observed in 1892

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