Cleaning shop floor with magnets - GIF

[Frank S]

Yes, chunks certainly in the pit below table and outside perimeter. I recall the oxidized dust piling in drifts everywhere else. It's like graphite, except abrasive and must be semi-spherical shape, because heavy parts slide nicely over it. Closest similar material is glass bead blast media, just as hard to sweep.

But a really good Tennent vacuum will make short work of it.