infill 20%
noozle: I used 0.8, but I think you can get better quality by using 0.6

layer height: 0.3
supports:no

Also you will need some sand or other material to fill the inside of the ingot (to make it heavier), then you have to glue the cover, or like me use 3d pen to weld the parts together. Later I used sandpaper to smooth it a litle bit and later painted it with gold paint in can.