When selecting a refiner, you will have to be very careful. A lot of the so-called refiners are only buyers, who in turn send the material to a real refiner. There are only a handful of true primary refiners worldwide. If you want to deal directly with them, two come to mind, Xstrata recycling in Canada and Umicore in Belgium. Needless to say, you will need big quantitites, 40,000 lbs minimum for boards or other gold bearing materials last time I heard. Umicore has a website with some technical information.
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