Category:Dahlgren-Quadrangle: Revision history

April 3, 2024

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July 6, 2023

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March 30, 2023

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January 18, 2023

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• curprev 15:3415:34, January 18, 2023‎ Alan.Myers talk contribs‎ m 2,208 bytes 0‎ Alan moved page Category:Dalgren-Quadrangle to Category:Dahlgren-Quadrangle without leaving a redirect

October 26, 2022

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• curprev 11:4511:45, October 26, 2022‎ Alan.Myers talk contribs‎ 2,214 bytes +2,214‎ Created page with "__NOTOC__ ==Mining in the Dalgren Quadrangle== The Opdyke Coal was close to the surface in the Dahlgren Quadrangle, usually less than 40 feet deep. Although the coal was thin, rarely reaching 4 feet thick, it was economic to mine by stripping off the overburden. Mining ceased in 1979, when the Eads Mine (mine index 917) closed. ==Map and Directory PDF Download== [https://wikiimage.isgs.illinois.edu/ilmines/webfiles/topo-mines/Dalgren.pdf Coal Mines In Illinois D..."