Walsen Mine, Waslsenburg, Colo. ID: 923 | This file appears in: Conditions at the CFI Mines of the Colorado Coalfields This undated image shows the foreboding entrance to the Walsen Mine at Walsenburg, Colorado. Pictured with two miners are their trusty mules. Often, mules would die of asphyxiation in the damp and dirty air of the mines. | Source: Donati, A, from the HIstory Colorado Online Collection. “Walsen Mine, Walsenburg, Colo.,” available at http://5008.sydneyplus.com/HistoryColorado_ArgusNet_Final/Portal/Portal.aspx?component=BasicSearchResults&record=e0dcd3c4-499b-4869-b382-8c1046771961. Download Original File SourceDonati, A, from the HIstory Colorado Online Collection. “Walsen Mine, Walsenburg, Colo.,” available at http://5008.sydneyplus.com/HistoryColorado_ArgusNet_Final/Portal/Portal.aspx?component=BasicSearchResults&record=e0dcd3c4-499b-4869-b382-8c1046771961. "Walsen Mine, Waslsenburg, Colo. " appears in: Conditions at the CFI Mines of the Colorado Coalfields