FILE PHOTO: A 2017 Chevrolet Bolt EV (L) and a 2017 Chevrolet Sonic vehicle are displayed outside the General Motors Orion Assembly plant in Orion Township, Michigan, U.S., June 13, 2017. REUTERS ...

ORION TOWNSHIP, Mich, Oct 7 (Reuters) - General Motors Co [GM.UL] is investing $145 million to reopen a Detroit-area assembly plant where it plans to build a new Buick compact car and a smaller ...