Helaman 12

 Mormon teaches - 

"...I would that all men might be saved. But we read that in the great and last day there are some who shall be cast out, yea, who shall be cast off from the presence of the Lord;

26 Yea, who shall be consigned to a state of endless misery, fulfilling the words which say: They that have done good shall have everlasting life; and they that have done evil shall have everlasting damnation. And thus it is..."  (Helaman 12:25–26)

I've heard members of the Church suggest that everyone will experience what they consider "eternal progression".  But it is clear of those that do not enter the highest degree of heaven - 

"He may enter into the other, but that is the end of his kingdom; he cannot have an increase."  (Doctrine and Covenants 131:4)

This is true doctrine.