I can usualy beat out ntr on most deals as they guys they hire to do the xrf do not know how to correctly prep the samples for xray assay, and hence, the assay always comes in low, since there is no incentive to fix this problem and billions of dollars flow in, its no wonder they grow so fast. When you claim to pay 98 and it ends up your only paying 96 to 90 or less. it also helps if the people they hire to run the stations are taught how to improperly do assays and they think they are doing things right, This way they can look at you with a straight face and tell you they are honest, because they dont know that they are doing things wrong!
considering xrf only meausres a few microns into the surface and considering base metals are pushed to the surface when melted and allowed to cool, and considering they dont use flux so you get a nasty crude on the surface, tell em to xray that and guess what, a lower assay and Money in the pockets of the one doing the xray...
xray I have found is nearly dead on when you know how to use it correctly. and know how to prep samples correctly. If you fail to do either one of those things guess what. its not accurate. And can be off as much as 13% from what I have found, but typicaly in the 3 to 5% range.
In any case, if your silver is fine I usually buy it at 95%
For most gold I buy at 97 to 98 if pure...depends on how much you have.
www.prospectorsgoldandgems.com
