What you are seeing here is the former Launch Control Facility (LCF) for India Flight, comprised of 10 LGM-30F Minuteman II Intercontinental Ballistic Missiles. Nicknamed "Melting Pot" by its crews, India-1 was manned by elements of the 67th Strategic Missile Squadron, 44th Missile Wing, formerly based at Ellsworth AFB outside Rapid City, South Dakota. Though it oversaw a flight of LGM-30A Minuteman I ICBMs in 1963, these were replaced with the Minuteman II between 1971 and 1973. It stood at the ready supporting the flight until the Air Force began retiring the LGM-30F from service starting in December of 1991 and wrapping up in April of 1994, in line with international arms-reduction treaties. I-01's deactivation entailed imploding its underground Launch Control Center, filling in the sewage pool, and removing all systems from the above ground LCF building.
You are looking for a micro hidden in the obvious spot. Bring your own writing stick as there will not be one in the cache. Please return the cache exactly as found, making sure it remains well-hidden.
As with all of our caches, enjoy the area, be safe and have fun.