Sources:
Germany: Ruhrkohle AG; Geologisches Landesamt Nordrhein-Westfalen, Krefeld; G Fettweis, 1953;  Ramana Rao Nunna, 1960
Netherlands: Rijks Geologische Dienst
Belgium: Kempense Steenkoolmijnen Zolder; Ministere de la Region Wallonne
France: Charbonnages de France

Active Coal Mines in 2012:
1: Bergwerk Ibbenbüren, Ibbenbüren (last coal 17 august 2018, closed 21 december 2018)
2: Zeche Auguste Viktoria, Marl (closed 18 december 2015)
3: Bergwerk Prosper-Haniel, Bottrop (closed 21 december 2018)
4: Bergwerk West, Kamp Lintfort (closed december 2012)
5: Bergwerk Saar, Saarlouis (closed june 2012)

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