Copper than less-developed countries (30–40 kg per capita). The process of recycling copper is roughly the same as is used to extract copper but requires fewer steps. High-purity scrap copper is melted in a furnace and then reduced and cast into billets and ingots; lower-purity scrap is refined by electroplating in a bath of sulfuric acid. Numerous copper alloys have been formulated, many with important uses. Brass is an alloy of copper and zinc. Bronze usually refers to copper-tin alloys, but can refer to any alloy of copper such as aluminium bronze. Copper is one of the most important constituents of
Sundown Tin and Copper Mine down 7 chains from the mine to the reverberatory furnace. The only building standing besides the furnace was the assay office. Firewood was swung across the creek to the furnace on wire ropes. The copper adit was driven , with winzes and drives off it, and a shaft connecting to the surface from the portal. The most recent smelting of 150 tons of ore produced 25 tons of matte containing 29% copper and 76oz silver and 6 dwt gold per ton matte. Mining recommenced in 1904, but was abandoned again in 1907, this time reputedly due to falling tin prices,