Alcoa (NYSE:AA) reported a sizable "earnings beat" earlier this month. But all's not well in alumi-land. Another aluminum manufacturer -- Century Aluminum (NASDAQ:CENX) -- has just warned workers and investors that it might be forced to close down its largest aluminum plant in the United States.

Find out why, and find out what other companies could be put at risk by a shutdown in Hawesville, Ky., as Fool contributor Rich Smith explains in the following video.

Fool contributor Rich Smith has no position in any stocks mentioned. The Motley Fool owns shares of General Dynamics and Lockheed Martin. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.