There are 3 scrap traders in a nearby city. about 15 km drive from my house.
Some years ago i bought a small 1 axle trailer, which i use as a "scrapbin on wheels" and when its full, i drive it to the scrapyard over small roads where the chance of meeting police is minimal, because the lights stopped working long ago.
I haul about 500 kg each time, and usually get 70 to 80 euro for it. Because i only have to hook up the scrapbin to the Volvo and go, it just takes about 90 minutes of my time to drive there, weigh, and unload. My cost would be the cost of fuel, which is 3 to 4 euro. As long as no cops fine me for not having proper lights, the rest is pure profit
I get about 1 euro per kilo for aluminium, copper and bronze. There is a different price for whole electrical motors.
When i ever scrap a large piece of machinery, i drive there by tractor and haywagon.
Calling them up, saying that you have 3 ton and want to know what their price is before going there, they usually give 1 or 2 cents per kilo more than if you just stopped by...