assay ton (AT)
assay ton (AT) :
A specialized unit of mass used by minerologists in assaying (testing) ores for the presence of gold, silver, platinum, uranium, or other valuable metals. One assay ton equals 29.1667 grams: just a little over an an ounce! The assay ton is actually a sample size. Since there are 87500/3 = 29166.7 troy ounces in a short ton (2000 lb), the number of milligrams of a precious metal in a sample of one assay ton is numerically equal to the number of troy ounces of that metal in one ton of raw ore. In Britain, the assay ton is based on the long ton and thus equals 98/3 = 32.6667 grams
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