Welcome to Explorer, a modification for Fallout: New Vegass that aim to expand the original game with a lot of new areas, items, weapons, quests and much more. As the name suggest the mod is focused on exploring discovering new places that are not tied with the main quest.
The Remote Power Mine, is a powerfull rare weapon that works like the C4 plastic explosive. You place it on the ground and use a detonator to make it blow up, resulting in a atomic explosion, like the FatMan projectiles.
This weapon can be also crafted on a work bench, but it require a high repair skill level.