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. 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[1])Sixty percent of the world’s supply of this commodity (10[1])was once produced in the Bolivian town of Potosi, and this commodity was the primary material used to make pieces of eight. For 10 points, medals of what material are given out to second-place finishers at the Olympics? ■END■ (10[1])