You can recover both silver and gold by using our methods. To start the process you hav to burn them in an iron pot with zero pollution (smoke can be dissolved in chemical solutions). Then grind them into fine powder. This fine powder containing ash, gold, silver, copper, nickel etc. will be now melted using 3 chemicals including borax.
There are mines where silver is dug. There are places where gold is refined. Men dig iron out of the ground and melt copper out of the stones. Men explore the deepest darkness. They search the depths of the earth and dig for rocks in the darkness. Food grows out of the earth, but underneath the same earth all is torn up and crushed.