Production:4110: Revision history

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    February 23, 2023

    • curprev 17:1717:17, February 23, 2023‎ Jennifer.Obrad talk contribs‎ 654 bytes +654‎ Created page with "{| class="wikitable" ! year !! DMM !! operator !! address !! production !! cumulative !! opening !! depth !! seam !! thickness !! method !! days !! emp |- | 1934 || || Helms & Smiley || Marion || 2,500 || 2,500 || || || || || ug || 150 || 4 |- | || || || || || || || || || || || || |- | 1935 || || R. E. Helm || Marion || 3,300 || 3,300 || || || || || ug || 270 || 4 |- | || || || || || || || || || || || || |- | 1936 || || Helm Coal Co.,..."
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