The treasure was probably buried for safekeeping by a wealthy Viking leader during the unrest that followed the conquest of the Viking kingdom of Northumbria in AD 927 by the Anglo-Saxon king Athelstan.
Although the hoard is thought to be worth up to £1 million it will need to be valued by the Independent Treasure Valuation Committee.
Meanwhile, the British Museum, in conjunction with the York Museum Trust and Harrogate council, will need to raise the funds to buy it and put it on show.