We should be capturing and mining those rocks, not throwing them away. But to capture a mountain moving at orbital speed will take more than anything made so far.
Niburu... is an asteroid that follows Earth orbit about 60 degrees (2 months) ahead of Earth. Check with NASA on that, they found it and named it years ago. It is small compared to an unworn mountain and doesn't have any way to break out of orbit and go sailing around half the solar system while changing size and mass.
It's also the name that total airheads attach to their psychotic fantasies and con-artists use to play on the stupid with. Oh noes! The UFO's are coming, a Niburu and a whole mini-solar system! Stock up on water and don't forget to BUY OUR BOOKS!