because there was copper found there during the gold rush, but I'm not so sure.
Copper is an important mineral discovered in Arizona that has played a significant role in the state's economy and history.
Gold, Silver and Copper.
Copper
There are actually 4 most important ores in Arizona and they are copper ,molybdenum, potash, and gold.
It is important historically and is still produced as a by-product of Copper production.
Copper Ore.
Arizona continues to be a major producer of copper.
Arizona is a major producer of copper.
Copper mining in Arizona happened in 2007.
Arizona's state mineral is copper. This is why Arizona's nickname is the copper state. Their state gemstone is turquoise. They don't have a state rock or stone.
Arizona produces the most copper in the United States.
Arizona was the largest producer of Copper in the US in 2007.