We build weathervanes from large pieces of sheet copper. Sheet copper is produced by a number of processes. The article from Copper.Org below provides a basic overview on mining methods, the processing of copper ore and other stages of copper production from beginning to end.
Click link for full article. Copper is a major metal and an essential element used by man. It is found in ore deposits around the world. It is also the oldest metal known to man and was first discovered and used about 10,000 years ago. And as alloyed in bronze (copper-tin alloy) about 3000 BC, was the first engineering material known to man.