The Alcan plant in Northumberland is shutting down, but the employees are giving a third of the money normally used for social events to help a local boy get a life-changing operation in America.
Archie Anderson has cerebral palsy and the money could help him walk more easily.
Archie's mum spoke to ITV Tyne Tees about her delight at the donation that means Archie can now travel to America for treatment.
Gary Saltmarsh, a pot operator, said: "We worked out it would come toabout £41 each. So we decided to give it to charity.""It was a chance to change someone's life.""Archie is a local lad and he's been in the local paper.""We had posters up in the smelter for him and we raised £200 for him before."
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."
Inside Alcan the mood is quite downbeat.Workers say only 'a handful' of the hundreds have jobs.Despite a works fair coming here in April, one worker says "the dole"is the likely next step.Despite this, they have donated £30,000 to charity.