To glitch out of the map, all you Need to do is dig a small horizontal hole, go to the end of it, and face the opposite direction. Then place a Ladder Brick or Copper Plate. Your Character should now be stuck in between the placed block and an ore/Terrain. Violently toggle shiftlock, jump, and move your camera in any direction possible. This will allow you to get out of that Position and freely walk around the ungenerated Mine.
sorry for bad english, if you encounter some spelling mistakes. im risking my sleep scedule or whatever it is called for this video
To land on the Level Elevators, stay in the following positions;
left Corner; 21, 21
left upper Corner; 21, 9
Right upper Corner; 38, 9
Right Corner; 38, 21