Category:Farmington West-Quadrangle: Revision history

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    October 26, 2022

    • curprev 15:2615:26, October 26, 2022‎ Alan.Myers talk contribs‎ 2,521 bytes +2,521‎ Created page with "__NOTOC__ ==Mining in the Farmington West Quadrangle== The mine notes for Dorthel No. 2 Mine (mine index 111) indicated that the Herrin Coal in this area was reputed to have two blue bands and many horsebacks in the seam. These impurities contributed to the Springfield Coal being the more-heavily mined seam, especially for mines with a longer productive lifespan and a large aerial extent. However, the earliest mining in the vicinity was in the upper coal due to..."
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