Fiery coals heaped on top increased the heat so that the hard metal melted and separated from the impurities in the ore.
وَتُحَذِّرُنَا كَلِمَةُ ٱللهِ أَيْضًا :‏ « يَأْتِي ٱلِٱجْتِرَاءُ فَيَأْتِي ٱلْهَوَانُ .‏