Blue Mine was worked consistently until about 1855, but was unused and filled with water (similar to its present state) by the late 1850's.
The mine was dewatered, a process that could take as much as a year, in the early 1870's and worked for a few years and again abandoned. It was dewatered and worked again from 1886 until the early 1890's. It was again dewatered in 1905 but operations were never resumed and it reverted to its present state.
During its prime Blue Mine produced 300 tons of iron ore a month. The vein of ore was as many as 16 feet thick in places and the mine extends over 500 feet into the hillside.
Today, aside from the gaping, water filled hole, all that remains are some concrete footings and stonework and the ruins of a dam about 300 feet upstream of the mine. The dam once included a waterwheel which powered the pumps that kept the mine dry.
