What American patriots metal company once supplied the us mint with copper?

The American patriots metal company that once supplied the U.S. Mint with copper is the Copper and Brass Research Association (CBRA). Founded in the early 20th century, this organization played a significant role in the production and innovation of copper and brass materials. While CBRA itself is more of a research and advocacy group, the production of copper for the U.S. Mint historically involved various foundries and companies in the industry, such as the Anaconda Copper Company and the Phelps Dodge Corporation.