Imagine using a shoe-sized lump of gold as a doorstopTo play this video you need to enable JavaScript in your browser.This video can not be playedImagine using a shoe-sized lump of gold as a doorstopCloseWatch the full episode on BBC iPlayer.SectionNewsPublished21 hours agoShareclose panelShare pageCopy linkAbout sharingRelated topicsGoldFollow Goldclose panelYou are now following GoldUpdates from your News topics will appear in My News and in a collection on the News homepage.Read description