What is "argyrocopeum"

Argyrocopeum, also transliterated as Argyrocopeion or Argyrokopeion was the place where money was coined in ancient Greece, especially minting with silver. In Athens it appears to have been in or adjoining the chapel ( heroon) of a hero named Stephanephorus, in which were kept the standard weights for the coins. In similar fashion, standard weights were kept in the Temple of Juno Moneta in the Roman Forum.