The really big boys in circuit board refining are the following:

Xstrata – Located in Quebec, Canada

Boliden – Located in Sweden

Umicore – Located in Belgium




These big boys have minimum quantities that they take measure in tons. I talked to people who deal directly with some of these big boys. I know to sell to Xstrata, you have to have a minimum of 15 tons per shipment. Payments are always based on assays, and you get paid a percentage of the metal content (minus refining chargers, sampling charges, assay charges, etc). They all have websites with some useful info.