Petersen, Max S.2007-01-032022-02-032007-01-032022-02-03http://hdl.handle.net/11124/6366Date scanned: 2002-6-12.USBM #62991; Churn drill used to prospect for lead-zinc ore. Platteville District, Wisconsin. - M. S. Petersen - March 1946.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 Upper Mississippi River Valley region was being prospected for lead in the 1820s, and by the 1850s had become an important lead-producing area. Zinc ores, previously discarded, were later identified as valuable, and by the 1870s zinc production exceeded that of lead. The last zinc mine in the area closed in the 1970s. The Platteville area was an important producer and had its first smelter by 1828.Rights management statement available at: http://library.mines.edu/digital/rights.htmlLead mines and miningMining machinery and equipmentZinc mines and miningStillImage