The claim is made in this thread on reddit:
Source: https://www.reddit.com/r/UFOs/comments/1hkuhfv/a_ufo_just_dripped_a_molten_metal_like_material/
Also included are images of the alleged UFO and its drippings:
There's a few more such images in the thread but I think that these are the best...
So it looks like AE911Truth has been incorrectly using another photos for many years. I noticed this by accident when looking at a similar photo posted yesterday for the anniversary of 9/11:
I saw the above (right) 9/11 thumbnail image on the NBC News home page, and it immediately reminded me...