Mine: Columbia Mine, Crystal Falls, MI

Began → Columbia Mine → Tobin mine shaft

From: 1882

Location: NW Sec. 31 of T43N-32W

Owned by: Corrigan McKinney Steel Col; now Republic Steel Corp.

Produced: Iron Ore

Method: Underground, worked by sub-level stoping. Depth: 1,783 feet.

Railroad connection: C&NW/ MILW pool to Escanaba docks.

Until: 1950

Lifetime Production: 4,308,6021 from 1882 to 1950. Continues.

Columbia ore is taken through the Tobin shaft. Tobin and columbia together comprise the old Sheldon Mine and the Shafter property.