“Agassiz’s first job as the Calumet mine’s new manager was the erection of a stamp mill, a task his predecessor had failed to complete. Around 1867 a new mill was built along the shores of a newly formed lake at the north end of the Calumet property – a lake known as Calumet Dam. One of the first structures erected on the site was a large sandstone clad pump house and companion boiler house. While the old pump house is no longer standing, its boiler house has managed to survive to this day.”