For the past eight years, visitors have been throwing coins into a fountain in the courtyard at Chatsworth.
Now the 260,000 coins have been cleared and sorted by a man who lost his 22-year-old son to cancer last summer and who wanted to give something back to Macmillan Cancer Support.
Tony Verdon and his family, friends and volunteers took five weeks to sort and clean 1.75 tonnes of coins from over 80 countries, raising nearly £7,000 for the charity.
Sam, who had a promising future as a professional golfer, was diagnosed in February with bile duct cancer which spread to his liver. He received support from the Macmillan Information Centre at Derby Royal Hospital together with palliative care.
Tony Verdon, aged 56, of Boulton Moor, near Derby, said: “When Sam died I wanted to give something back to thank Macmillan for their incredible support and it helped provide me with a focus.
“I became a volunteer for Macmillan and they asked me if I would be interested in this project.
“At first we thought we were looking at 25 small bags of coins. It was only when two vans turned up at my house and 87 large plastic sacks filled with coins were unloaded that I realised the project was a lot bigger than originally thought!”
A fund in Sam’s name already stands at £11,800.
The Duke of Devonshire said he and the Duchess were “extremely grateful” to the Verdon family and everyone involved in the project.
“ We are so pleased that the coins tossed into the fountain by visitors to Chatsworth over the past eight years will help Macmillan continue their excellent work across Derbyshire.”