Copper in Ancient India c12.s2.13

c12.s2.13

inches. During a day of nine or ten hours 3 maunds charcoal, 2½ mds, roasted ore and 2 mds, iron slag were consumed. The slag was drawn off and the molten copper remained at the bottom and removed next day. It was then re-melted in an open furnace under a strong blast of air and then cast into ingots of refined copper.