#mine  excavation in the earth from which ores and minerals are extracted
  supertype:  #hole_in_the_ground__excavation  a hole in the ground made by excavating
  part:  #adit  #mineshaft  #shaft.passage
  part of:  #colliery
  subtype:  #coal_mine__coalpit  a mine where coal is dug from the ground
  subtype:  #copper_mine  a mine where copper is dug from the ground
  subtype:  #goldmine__gold_mine  a mine where gold ore is found
  subtype:  #salt_mine  a mine where salt is dug
  subtype:  #silver_mine  a mine where silver ore is dug
  subtype:  #strip_mine__stripmine  an open mine (usually for coal) where the seams run close to the surface
  subtype:  #sulphur_mine__sulphurmine__sulfur_mine  a mine where sulphur is dug from the ground

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