Chiyaan Vikram And Pa Ranjith's Thangalaan Is set In KGF, Reason Behind India Called ‘Sone Ki Chidiya'

The main reason why the nation used to be called the Golden Bird is the Kolar Gold Fields. K.G.F. was one of the biggest Gold Mine in the World. Britishers exploited this mine and took over 900 tonnes of gold to England.