Haifukiho, or the ash-blowing method, was a method of producing this good in Joseon Korea. Yamabuki Castle was said to protect one site for production of this commodity, Iwami Ginzan. (-5[1])Over time, Huancavelica displaced Almaden as the main supplier of one product needed to (-5[1])process this commodity. Quantities of this commodity from (*) Acapulco (10[2])were exchanged (10[1])for (10[1])Chinese (10[1])silk and porcelain in the Manila Galleon system. (10[2])Sixty percent of the world’s supply of this commodity (10[1])was (10[1])once produced in the Bolivian town of Potosi, (-5[1])and this commodity was the primary material used to make pieces of eight. For (10[1])10 points, medals of what material are given out to second-place finishers (10[1])at the Olympics? ■END■ (10[1])