The Young Bulls had to come from a goal down, conceded in the 4th minute, to win with two 2nd half goals.
Firstly, Captain Brad Wilson hit a superb volley from just inside the box after Chesterfield had failed to clear a corner and then substitute Dean Rick showed his composure inside the box to turn his marker and rifle the ball past the Chesterfield keeper.
The Young Bulls had to play the last 10 minutes with 10 men after Eden Homer was sent off for 2 yellow cards. But they stood firm and are now joint 2nd with Ilkeston but with a game in hand.
AFC Mansfield: Caller, Williams, Spencer, Wilson (C), Chadburn, Sowter, Homer, O'Malley, Brewin, Park (Rick 65). Subs not used: Parker, Ingram & Man
Referee: Mr Steve Sears
Man of the Match: Brad Wilson