2007-01-032022-02-032007-01-032022-02-03https://hdl.handle.net/11124/7377Date scanned: 2002-6-12.H-9; Blast of vertical holes. Blast consisted of 7500 pounds of Hercules Gelamite I and Gelamite D 60% explosives loaded in 25 32-ft. to 50-ft. deep vertical holes spaced 15-20 ft. apart in rocky iron formation. Detonated with one detonator and safety fuse. Richmond Mine, The M. A. Hanna Company, Palmer, Michigan. - F. G. Anderson - August 7, 1947.Held in the Russell L. and Lyn Wood Mining History Archive, Arthur Lakes Library, Colorado School of Mines.Donor: United States Bureau of Mines.The Richmond Mine is an open pit iron mine near Palmer, Michigan operated by the M. A. Hanna Company. The M. A. Hanna Company was one of the large mining companies that moved into the Michigan iron area in the early 1900s, consolidated smaller properties, and engaged in exploration for other economic deposits. The company was dissolved in 1965, then resurrected in 1985.Rights management statement available at: http://library.mines.edu/digital/rights.htmlM. A. Hanna CompanyBlastingIron mines and miningOpen pit miningStillImage