All,
Those boards since they were only 13.5kg, were manually depopulated, Ta capacitors were sorted and separated, and the rest of components including the gold plating that is shown in the picture which was trimmed from boards, total weight of 8kg, were smelted and got 16g of gold powder which was melted by client so melting losses or purity of button is unknown.
Amount of silver and palladium is unknown yet, but upon stannous test showed very strong palladium presence in nitrate solution.
Regards
Kj