Assay ton
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A weight of 29.166 grams used in assaying, for convenience.Since it bears the same relation to the milligram that a ton of 2000avoirdupois pounds does to the troy ounce, the weight in milligramsof precious metal obtained from an assay ton of ore gives directlythe number of ounces to the ton.
Assay ton meaning & definition 1 of Assay ton.