Quicksilver is the colloqial name for Mercury. Element number 80 and symbol Hg. Hg is because the name was formerly Hydrargyrum (from the Greek hydor 'water' and argyros 'silver'). Mercury is the only metal that is liquid at standard temperature and pressure.
Previously there was a cache here called Quicksilver, but the cache disappeared and the former CO serves in a the military and has been transferred out of the state so he archived the cache.
Congratulations to InMotion for the FTF!
(I have them to thank for getting me started geocaching.)