Victoria Mine is a series of copper mines located in Rockland Township, Ontonagon County, in Michigan’s Copper Country. It was near this location that a large piece of float copper, also known as the Ontonagon Boulder, was found. The mine operated off and on from 1849 until its final closure in 1921. Most of the metal found there is low grade native copper from the Forest Lode.^[2] Quartz, epidote, calcite, prehnite, and pumpellyite are also found in the rock.^[3]

• http://en.wikipedia.org/wiki/Victoria Mine