|Pausanias VI 19, 1-4
Pausanias about the treasury of Sikyon:
In the Altis, north of the temple of Hera, there is a terrace of chalk-stone and behind it rises mount Kronios. On this terrace are the treasuries, comparable to those that some Greeks have built for Apollo at Delphi. At Olympia there is a treasury that is called the one of the Sikyonians, dedicated by Myron when he was tyrant of Sikyon. Myron has build this treasury after he had won the race for four-horse chariots in the 33th olympiad (648 BC). In the treasury are two chambers, one in Doric and the other in Ionic style. I have seen that they are made of bronze. … In the smaller chamber there are inscriptions: one says that the weight of the bronze is five hundred talents and the other that Myron and the people of Sikyon dedicated the treasury. In this treasury there is a dedication of three discuses, which they use for the contest of the pentathlon. There is also a shield, on the outside covered in bronze, on the inside painted in various colours, with a helmet and greaves. On the weapons is written that it is a dedication for Zeus from the spoils laid down by the Myonians.
A talent weighed about 30 kg. This means that there was about 15,000 kg bronze to the walls of treasury. So the value of the metal, which the Sikyonians had stored at Olympia, was gigantic.