Metal detector
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Top tips for metal-detecting

14 October 2014 Last updated at 16:02 BST

The amateur metal detector, who unearthed a massive hoard of Viking treasure in Scotland, has been telling Newsround how he did it.

Finding buried treasure might sound like a dream but it's one that came true for Derek McLennan.

He dug up more than a hundred objects, including gold jewellery and a silver Christian cross.

Derek tells us how we can get involved in metal-detecting.