Arizona’s Capitol has one of the most underrated copper facts in the state. The copper roof on the Arizona State Capitol building reportedly contains enough copper to make about 4.8 million pennies. That’s millions of one-cent coins worth of copper sitting right above the building that represents the state. And it makes sense — Arizona isn’t called the Copper State for nothing. Arizona produces about 70% of all copper mined in the United States, making it the backbone of America’s copper supply. The greenish tint you see on historic copper roofs and statues is called patina. It’s a natural protective layer that forms over time and helps preserve the metal underneath. The Capitol building was completed in 1901, during the height of Arizona’s early mining boom, when copper was helping shape the state’s economy and identity. More than a century later, copper is still one of Arizona’s most important industries — from massive open-pit mines to the roof of the Capitol itself. Did you...