Why is silver associated with Argentina?

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The name Argentina is derived from the Latin 'argentum' meaning silver. 'Argentina' therefore means the 'land of silver'. Do you know why it got this name?
The orgin of the name can be traced back to the voyages made by the first Spanish conquerors up a vivors, of an expedition mounted by Jan Diaz de Solis around 1516, discovered a group of native Indians, who presented them with so many silver objects that the river was named Rio de la Plata' or Silver River. In time, the country itself was called Land Plata which means Silver in Panish. When the rule of Spain ended, the name was changed to Argentina from the Latin Argentum.