Electro-refining as performed by Johnson-Matthey NOT BGM Although this is
not from J&M's facility, here's an electro-refining to 999.9 (4-9s) purity photo of one small cell's finished product, prior to pouring into another mold in a MELTING operation, one which does not use a flux nor have any slag that needs removing after the final pour.
This is time consuming. Extra cost incurring, and NOT performed as a rule, on the local miner level of processing circuit production. The product produced by BGM is called DORE' as explained earlier. The product produced by an electro-refining facility is called FINE GOLD, and is stamped with purity, weight, mfg mark, and a serial number before shipping to the end user. Some end users are mints, drug manufacturing company, electronics manufacturer for use in CHIP/CPU mfg or plating onto connectors and memory cards, Asian jewelery fabricators, and other related examples.