Civik War era copper miner photo

[major bill]

Copper was avn essential resource during the Civil War. Michigan was supplying vast amounts. In 1864 Mvichigan mined 12.5 million pounds of copper at 46 cents per pound. This is how the miners looked.

 

[gary]

So crucial for making brass/non-ferrous metals.

 

[Waterloo50]

Some tough old boys there. What is the structure in the photo?