To get a fire assay done is no problem. Fire assay is used for all kinds of ore samples, mineral concentrates, and other precious metal bearing materials. Usually those kind of materials are fairly homogeneous, and taking a representative sample is not a problem. The problem with assaying any ewaste is that the material is not homogeneous (some individual components contain a lot of gold while others contain nothing). This would apply to any assay method, not only fire assay. Most fire assays are done on a relatively small sample (10-100 g). It will be very difficult to get a representative sample. Whoever you pick, make sure you ask a lot of questions on their sample preparation and sampling methods. This would be also true when you are sending a 20,000+ lb load to a refiner. Most problems arise out of the sampling, not so much from the assay itself. I used to do fire assaying before at one of my previous employers.
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