Northwestern Mine, Galena, IL, 1904-1913.. Early lead smelter, near Galena, IL, ca. 1850. Zinc miners "riding the can" down the mine shaft (mine and date unknown). Mine map of the Shullsburg Unit, Eagle-Picher Co., Shullsburg, WI (after Beck, USBM, 1964) Mechanized mining in the final days of the UMV District. (mine and date unknown).