A jury…acquitted W.R. Grace & Company and three of its former executives of having knowingly exposed mine workers and residents of Libby, Montana, to asbestos…Prosecutors plan to try another executive separately. Asked if the Justice Department plans to appeal, department spokesman Andrew Ames said, "I wouldn't want to comment on that."…During the trial, those who lost loved ones testified…that residents had been kept in the dark about the dangers…Had it been convicted, the company could have faced criminal fines of up to $280 million…Grace executives…could have faced prison time…W.R. Grace denied any kind of conspiracy. In fact, the company said, it acted responsibly and took appropriate steps.