||This article needs additional citations for verification. (November 2009)
For the Sherman mine near Leadville, Colorado, see Mount Sherman
Sherman Mine is a large abandoned open pit mine in Temagami, Ontario, Canada. It was a major producer of iron ore. The mine was the source of a multi-ton boulder of banded iron formation and was mined from 1968 until 1990 by Cleveland-Cliffs Iron Company. This 2.2 billion year old formation consists of thin layers of sediment that were deposited in a marine environment and subsequently metamorphosed. Sherman Mine is the largest open pit mine in Temagami, consisting of seven open pits known as the East Pit, South Pit, North Pit, West Pit and the Turtle Pits.
Its mineralogy records a time in the early Earth's history when the atmosphere and oceans contained significantly less oxygen than their present day counterparts.