Industry
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At the 19th-century Burra Burra roast yards, which extended for 14 acres, raw copper ore was roasted in open sheds during the early days of mining. Each roast heap required 65 cords of wood, and the process took 60 to 90 days. The resulting matte was then broken up and placed in furnaces for smelting. Open roasting ended after pyritic smelting was introduced in 1903.
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Ducktown, Tennessee · United States
