Cuyuna Range

[1] Though covered by Pleistocene glacial drift up to 200 feet thick, 1859 surveyors noted compass deflection while in the area.

In addition to the iron, the ore was rich in manganese, which was useful during World War I, with 32 mines operating.

[3] On February 5, 1924, a new tunnel was blasted too close to nearby Foley Lake, and water rushed in, killing 41 miners.

Cuyuna Country State Recreation Area now occupies portions of the range where mining pits and rock deposit stockpiles were left behind by the miners.

[4] The rocks in the district consist of tightly folded layers parallel to the axis of the Lake Superior Syncline.