Archie Anderson suffers from Cerebral Palsy and has difficulties walking. But a £50,000 operation in St Louis Hospital, Missouri, could give him a chance.
The workers, who are being made redundant, have donated their entire social fund to three charities - one of which is Archie's charity.
The donation from the Rio Tinto workers brings his total to more than £45,000.
Marie Anderson, Archie's mother, has tweeted: "Thank you so much to the workers at Alcan for your wonderful donation to Archies Dream."
More top news
The app contains over 75 weird and wonderful stories of things that have happened in the city over the past 800 years.
South Shields dancer Stuart Hatton has made history by becoming the first British man to win Mr Gay UK for a second year running.
Ed Milband outlines Labour's devolution plans during plant visit to Nissan's Sunderland factory.