Copper in architecture used in residential and commercial building structures. Variations in color stem primarily from differences in the alloy chemical composition. Some of the more popular copper alloys and their associated Unified Numbering System (UNS) numbers developed by ASTM and SAE are as follows: In practice, the term ‘bronze’ may be used for a variety of copper alloys with little or no tin if they resemble true bronzes in color. Further information on architectural copper alloys is available. The criteria by which copper and copper alloys are selected for architectural projects include color, strength, hardness, resistance to fatigue and corrosion, electrical and
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,