Tong nue kao has been said to be Gold with a purity close to one hundred percent pure gold. The purity of the gold is measured by the mixing of the gold. How many other metals? which can be reflected from the color of the gold If it was very pure, it would have a bright yellow color. The famous nine gold sources in Thailand are sourced from the city. One of the provinces of Prachuap Khiri Khan, which is Bang Saphan, therefore calls this gold as Bangsapan Gold.
The reputation of Bangsapan Gold has been known for a long time. From the late Ayutthaya period during the reign of King Borom-urn From the city lord brought the gold to offer and after that, he ordered the gold mining in that area, which is believed that in just a year a fraction can get up to 90 weighs of gold, or a total of 3,600 baht of gold