Mine: Calumet & Hecla Mine, Calumet, MI
Various → Calumet & Hecla Mine → Closed
Owned by: Calumet & Hecla Mining Company in 1871, then Universal Ol Products in 1968.
Produced: Copper Ore
Method: Underground shaft mining.
Railroad connection: C&H Railroad
Until: 1868 (strike). Mine dewatering pumps turn off in 1970.
From 1869 to 1886 it was the leading copper ore producer in the United States. By 1881 the mines had 16 shafts. By 1897 the Red Jacket shaft rached a vertical depth of 4,900 feet, the deapest in the world at the time. [Wiki]