Williams, M. L.2007-01-032022-02-032007-01-032022-02-03https://hdl.handle.net/11124/5687Date scanned: 2002-6-20.USBM #66180; Overhanging ledges in high-wall resulting from collapse of water-filled sand pockets. Velva Mine, Truax-Traer Coal Company, Velva, North Dakota. - M. L. Williams - April 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 Velva Mine was an open cut (open pit) coal mine near Velva, North Dakota. The Mine was operated by Truax-Traer Coal Company. Truax-Traer operated a number of coal mines using strip mining techniques in North Dakota and other states. The Company was purchased by Consolidation Coal Company in 1962.Rights management statement available at: http://library.mines.edu/digital/rights.htmlTruax-Traer Coal CompanyCoal mines and miningOpen pit miningStillImage