Duke Visit To Uranium Mine -- Thumbs hooked in the belt of his denim overalls and wearing a protective helmet is the Duke of Edinburgh making a tour of inspection underground in the Eldorado uranium mine at Port Radium, 30 miles south of the Arctic Circle in Canada's North West Territories. After being shown over the mine, the Duke received members of the staff and their wives at an informal reception in the reception hall. August 11, 1954.