The term MINE ENTRANCE can be broken down into three separate crossword solutions: ADIT (4 letters), STULM (5 letters), and MYFRONTDOOR (11 letters). An ADIT is an entrance to a mine, usually horizontal, that provides access for drainage and ventilation. A STULM is a type of mine entrance that is constructed by cutting into the side of a hill or mountain. Finally, myfrontdoor is a term used to describe a mine entrance that is located at the front of a building.