coalface

Short definition from Wiktionary

Noun

1. 1
   The surface of coal exposed by mining, or a part of a coal seam that is currently being mined.
2. 2
   The end of a drift, entry, or room in a coal mine.
3. 3
   A place where difficult or strenuous work is done.
4. 4
   A place where more tangible, practical, or direct work of an activity is done, as opposed to theoretical or managerial work.