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Laurie Palmer, A55 road, Aaron Dunn, Abandoned mine, Abandoned mine drainage, Abdoulaye Ndiaye, Aberllefenni Slate Quarry, Abernant, Powys, Abitibi-Témiscamingue, Abovyan mine, Absaroka-Beartooth Wilderness, Abtweiler, Abu Tartur mine, Abyssal plain, Acacia confusa, Acacia Mining, Access mat, Acid mine drainage, Acidophiles in acid mine drainage, Acland No. Mining is the extraction of valuable minerals or other geological materials from the earth, usually from an orebody, lode, vein, seam, reef or placer deposit.