coalface

noun4

1. •
   The surface of coal exposed by mining, or a part of a coal seam that is currently being mined.
2. •
   (UK, figurative) A place where difficult or strenuous work is done.

   • Lizzie had paid her own dues at the coalface of teething babies and gave the young mother an understanding grin in return. — 2007
3. •
   (UK, figurative) A place where more tangible, practical, or direct work of an activity is done, as opposed to theoretical or managerial work.

   • While schools were seen to be at the coalface of administering arts education, teachers, artists and children were rarely consulted in relation to the development of arts education policy. — 2006
4. •
   The end of a drift, entry, or room in a coal mine.