Shortly after the conquest of Yauna by Khsrish I the Conqueror, the silver mines in Laurium struck a particularly rich lode of silver. Some 400 years later the mines were still producing a talent of silver (about 40 to 50 pounds) per month. Polydoros speculated that if the big lode had been discovered before the Khsrish came, then perhaps the natives would have been able to afford to build sufficient ships to defeat them. Mithredath dismissed this as wishful thinking.