Author: Dewi (Pws) Morris, Rhiannon Roberts.

A sequel to Dewi, Dwpsi a'r Dreigiau. Dewi has gone on a school trip to the Clogau gold mines, near Dolgellau only to discover that all the gold has disappeared! In order to solve the mystery he has to blow his magic whistle to summon help from his friend, Dwpsi the dragon and Eryl, the enormous eagle.

Awdur: Dewi (Pws) Morris, Rhiannon Roberts.

Dilyniant i Dewi, Dwpsi a'r Dreigiau. Mae Dewi wedi mynd ar ymweliad ysgol i fwyngloddiau aur Clogau, ger Dolgellau dim ond i ganfod fod yr holl aur wedi diflannu! Er mwyn datrys y dirgelwch rhaid iddo chwythu ei chwiban hud i gael cymorth ei gyfaill, Dwpsi'r ddraig ac Eryl, yr eryr anferthol.