The largest solid gold Buddha statue in the world is housed in Wat Traimit in Bangkok Thailand. It weighs a staggering 5.5 metric tones and stands an impressive 3 metres tall. At current gold prices of $1500 an oz it weighs around 200,000 oz of gold and would cost in precious metal alone at least $300 million !
Remarkably this was lost to the world for many years as it had been covered in plaster stucco some time in the past to hide its real value and over the years had become forgotten in an abandoned temple. When the statue was moved in the 1930s some of the plaster fell off revealing the true nature of the statue underneath.
Resource : http://thebuddhasface.blogspot.in/2011/07/largest-solid-gold-buddha-statue-in.html