X-ray fluorescence analysis (XRF), a non-destructive method of determining the composition of an object, confirmed that this bronze ingot was comprised of 79.5% copper, 13.2% tin, and 5.6% lead. Tin deposits are not found on the Korean Peninsula, and clear evidence of copper smelting in the Bronze Age has yet to be confirmed. It is therefore possible that such lumps of bronze, which were alloys of copper and tin, had been obtained from somewhere else to make bronze objects.