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According to Quora:
The "Elephant's Foot" is still lethally radioactive and isn't really going anywhere since it is solidified material. Though it's following a radioactive decay curve, it's still going to be awhile before it's anything remotely resembling safe. It's cool enough to be cycling in temperature with ambient conditions and it is crumbling here and there, but by and large just sitting.
Apparently, it has since broken up:
http://rarehistoricalphotos.com/the-elephant-foot-of-the-chernobyl-disaster-1986/