If you have some spare time this is an interesting paper on fire assays: the method, flaws and alternatives. http://analytical.com.pe/adminanalytical/img/Gold%20Analysis%20-%20Fire%20Assaying%20and%20Alternative%20Methods.pdf
I will admit the yellow mineral looks very similar to a chalcopyrite vein, dont know why they were going on about it.
If you have some spare time this is an interesting paper on fire...
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