By Costas Pitas
LONDON (Reuters) - The closure of Opel's Bochum factory in Germany will cost a total $866 million (635 million euros), the president of parent company General Motors
The firm decided last year to close the plant as part of a drive to bring down costs in Europe and has since been negotiating with the IG Metall trade union.
On Wednesday, Ammann said the firm had already booked $381 million of the cost in its results from last year and the first quarter of 2014.
A further charge of $485 million will be taken during the course of this year with the total figure expected to stand at $866 million, Ammann said.
The figures relate to both vehicle and transmission facilities at the Bochum site.
Last week, loss-making Opel said it had reached a severance deal with workers at its Bochum factory, with the closure seen as a key step in the automaker's restructuring.
The firm had not previously given a figure for the cost but two sources told Reuters in May that they expected the sum to total 550 million euros.
(Editing by Keiron Henderson)