If a player has a mine-detector and detects a mine within radius, then he says to himself about it! For the player, this moment looks silly.
I think mine-detector in the moment of detection enemy mine, should have special sound signal.
At this, not necessary to remove the voice of the player-character - "I see mine". BIS, you can leave It in some cases.
Thus the player will always respond to danger mines, during the special signal and this moment, will seem more realistic.