Underground Mining Museum In 1877, Iron Cliffs began exploratory drilling on this site overlooking Ishpeming. Drilling uncovered iron ore, and in 1879 the company opened the Cliffs Shaft, then known as the "New Barnum". A new boiler house and engine house have been built on the location in the https://jeffrey7b222.therainblog.com/6860090/geologic-characterization-report-for-the-paradox-basin-study-region-ut-by-united-states-department-of-energy