Bisbee Mining & Historical Museum In 1877, Iron Cliffs started exploratory drilling on this web site overlooking Ishpeming. Drilling uncovered iron ore, and in 1879 the corporate opened the Cliffs Shaft, then generally known as the "New Barnum". A new boiler home and engine house were built on the https://zionaktbk.blogsvirals.com/6903846/global-innovation-index-2019