No advice on reclamation methods but just a comment on what you have to work with. When I worked at Square D a number of years ago, contacts were made in a powdered metal using silver, tungsten carbide and binders. The whole mix and process was proprietary but I presume others in the industry use something similar. So you should have two useful commodities there. And there are companies that specialize in separating scrap streams to wind up with rolled sheet stock in steel, copper, brass, etc. Synopsis is maybe you can sell the copper, steel, and contacts as a collection and let the professionals worry about the details of recovery.
"Opportunity is missed by most people because it is dressed in overalls and looks like work." Thomas Edison