Category:Gorham-Quadrangle: Revision history

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    October 26, 2022

    • curprev 16:1616:16, October 26, 2022‎ Alan.Myers talk contribs‎ 1,546 bytes +1,546‎ Created page with "__NOTOC__ ==Mining in the Gorham Quadrangle== Only one mine is known to have mined in the Gorham Quadrangle. The Poplar Ridge Coal Company (mine index 4238) operated a small slope mine which opened in 1931 and closed in 1934. The coal seam mined may be an un-named seam in the middle of the Tradewater Formation, but it has been called the Tarter Coal to locate the seam in the stratigraphic section. ==Map and Directory PDF Download== [https://wikiimage.isgs.illin..."
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