Copper-bearing Fissure Veins, Keweenaw County, Michigan, Lake Superior Native Copper District (Part 2).

The article reports on the history, geology and mineralogy of the fissure veins of Keweenaw County in the Michigan Copper County. The deposits in the fissure veins that established the discovery and development of the amygdaloidal and conglomerate loads, is the precursor of the first mining rush in the U.S. The mining site, before its closure produced million pounds of copper in its 132-year of operation. Other details about Keweenaw County as a mining site are also presented.