Category:Illinois City-Quadrangle: Revision history

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    October 27, 2022

    • curprev 08:1608:16, October 27, 2022‎ Alan.Myers talk contribs‎ 1,940 bytes +1,940‎ Created page with "__NOTOC__ ==Mining in the Illinois City Quadrangle== The mines in this quadrangle are un-named slopes and drifts in ravines. They are believed to have been operated as early as the Civil War, and the last one closed around 1940, but no operating names have survived. Consequently, it is not possible to know the production or the approximate undermined acreage. The Rock Island Coal was the only seam mined. However, the lenticular and discontinuous coal, known locally as t..."
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