I would be very surprised if they would allow you to see how the assay is performed for GNH samples because their data is supposed to be protected to ensure it is not used for illegal trading purposes. What, if by chance, you happened to see a nice sized piece of gold on the Mesh screen while you were there? I believe this would get them into big trouble. You might be further ahead calling as if you were a potential customer and asking what their current turnaround times are for fire and pulp screen assays.
Best,
Scott