最終更新日:2022/12/24
Roasting the ores is done with the charcoal braze (or fine charcoal from the charring) in heaps of thirty feet width, fifty-feet length and twenty feet height, containing 3,200 tons.
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Roasting the ores is done with the charcoal braze (or fine charcoal from the charring) in heaps of thirty feet width, fifty-feet length and twenty feet height, containing 3,200 tons.