You have to walk very slowly up to the control panel on the mine until you get the prompt to disarm. Just push your left stick up slightly so you are walking slowly. The mine will blink and beep as you move but as long as you don't go too fast it won't go off. This is only on the pink mines. The control panel has a green light on it. Some you have to walk slowly around it to get to the control panel. There are 5 total.
1 - Right side of map on an ice shelf across a stream
2 - North side of map across railroad tracks
3 - On a ledge east of the farm
4 - On the path south of the farm
5 - On a ledge on a ledge, south edge of buzzard academy
Did this from memory so apologies if directions are off a bit.