Copper mining in the United States

In the United States, copper mining has been a major industry since the rise of the northern Michigan copper district in the 1840s. In 2017, the US produced 1.27 million metric tonnes of copper, worth $8 billion, making it the world's fourth largest copper producer, after Chile, China, and Peru.

Source: Wikipedia — Copper mining in the United States (CC BY-SA 4.0)