Geo thank you for helping with details, and I do not know if your melting steps would work, it is very possible they would, as I am unsure what else the “MUD” is, either one of our solutions to this problem may work, and I am not trying to step on any body’s toes here, and I will just give some Idea How I may try and handle this hog fat “Mud”.
Silver nitrate is soluble in water, or dilute nitric acid, the picture, and the materials in the jar, what is that cooked hog meat, or silver and hog fat?
Silver nitrate could be brought into solution, you could test to see if silver was actually in the solution, after filtering if the solution had silver, by taking a sample of solution and add HCl, a white cream or white curds would prove silver, silver from solution could be cemented on copper, as fairly pure silver.
If oils or hog grease was involved that should also be dealt with, the evaporation down to mud would have helped, and incinerating the mud would be my next step.
At this point I think I would dry what you call mud, incinerate red hot, (you can test a sample of this powder before proceeding), get silver into silver nitrate solution filter and then go from there.
I would not skip testing steps, as you could just be cooking hog fat for nothing.
My idea on this other members may have a different approach.