Civil War years 1861-1865
Albany and Boston Stamp Mill 1865

The Civil War, and the great demand for copper, helped to fuel the largest number of organized companies in the Copper Country.  I estimate that well over 150 mines, some real and some only on paper, were formed during this period.  Here are a few that perhaps you never heard of...

American Mining Company
Dorchester Mining Company
Mandan Mining Company
Bay State
Isle Royale
Minesota Mining Company
Wyoming Mine
Cuyahoga Mine
New discoveries