Owned a non-ferrous scrap yard for 13 yrs. Bought anything non-ferrous which included silver. some gold, high alloy nickel content metals. Had contracts with the electrical, pharmaceutical companies. Did a lot of military assets from the auctions in the 90's.
The military base in Toronto closed and it had assets that went back to the 50's, all the decommissioned electronics were stripped of any hazardous materials then sold off at the action.
The large bulky items were a real pain for the auction house to deal with so this is where I came in and bought the stuff presale days.
Large radar, bulky cabinets, equipment that were in wooden crates.
This all started with one sale/purchase of 2 Tutor Jets that collided midair at the air show in 1989. I bought them in 1994 for complete destruction-meaning no salvageable part was to be resold for collector purposes. I did find 13 envelopes that contained parts of the aircraft that were removed from the pilots body.
These envelopes were returned-and never mentioned for 15 yrs.
It was the start of many years of low cost flow of goodwill bidding on scrap.
The electronic scrap was from the 50/60/70's and had heavy gold bearing contacts. The silver contacts were easily scrapped, the boards/chips/fingers all were sold to another recycling broker that specialized in electronics.
One purchase was these transducers 6ft high 4ft across that contained 45 gallons of cod liver oil, silicon aluminum blocks that weighed 10.3 lbs each. Each block had a crystal pack and each individual crystal that was pure salt basically was wrapped with a gold flashed silver foil. This entire block was covered with cork, which had to come off to sell the aluminum.
Solution was go down the street to the chemical company supply and buy a drum of what the main ingredient of what paint stripper contains. Full respirator, rubber gloves to the armpits, apron, and the stripping of the cork was completed.
The gold/silver strips were another thing, so I placed them in a wire tote placed out back for 10yrs and let nature dissolve the salt crystal packs. I recovered 46 LBS of this product, which was then sold to the refiner.
I kept one sample as a reminder of the fun filled days of recycling PMs.