[vlahmot]

Not sure about volume but mass wise it’s a drop in the bucket. About 4% of the moons mass according to Wikipedia.

I was surprised to learn that the earth is about as massive as Mercury, Venus, Mars, the moon and a few more moons combined.

[mr_toad]

The Earth is too massive - almost all of the earths mass is below the crust and inaccessible due to extreme temperatures and pressure, bad sci-fi movies not withstanding.

Most asteroids have so little gravity that mining them out would be quite feasible.