The bright yellow flow is molten matte copper being tapped off of the flash smelting furnace (FS). It is approximately 68-70% pure copper at temperatures well above 2200 Degrees Fahrenheit and will flow down a short heated launder into the matte granulator (see image 70) where is will be prepared to be fed into the FC furnace and further refined into blister copper with a purity of 99.8% copper.