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Essential Fire Assay Terms

13-Mar-17

TContext01_Assay_Ton.doc

as used in Textbooks

"Assay-ton"

Author

Context

Rose

In weighing the materials for a crucible charge the use of a set of assay-ton weights saves much labour in calculation. The assay-ton is a weight which contains as many milligrammes as a ton contains ounces.

Thus an English or long ton of 2,240 lb ... contains 32,666 Troy oz, so that the corresponding assay-ton must weigh ...  32.666 g. If the weight of the resulting bead of gold (or silver) from an assay-ton of ore is 1.5 mg, then the ore contains 1.5 oz of gold per statute ton.

If the value per short ton of 2,000 lb (used in North America) is required, the weight of the assay-ton is 29.166 g, since there are 29,166 Troy oz in 2,000 lb avoirdupois. (p. 441)

Smith

The Assay-Ton System —To facilitate calculation a system of weights, known as the "assay-ton system" (abbreviated A.T.) has been devised, which is a combination of the Troy and Avoirdupois systems with the French metrical system. The unit of the system is the "assay-ton", which for the English system (2,240 lb to the ton) is 32.6666 g. (p. 59)

Wikipedia

Assay ton (abbreviation 'AT') is not a unit of measurement, but a standard quantity used in assaying ores of precious metals; it is 29+1⁄6 grams (short assay ton) or 32+2⁄3 grams (long assay ton), the amount which bears the same ratio to a milligram as a short or long ton bears to a troy ounce. In other words, the number of milligrams of a particular metal found in a sample of this size gives the number of troy ounces contained in a short or long ton of ore.

 

 

 

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пробирная тонна

 

 

 

 

 

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REFERENCE BOOKS
"A Textbook on Fire Assay"                                                                Edward E. Bugbee
"Fire Assaying"                                            Orson C. Shepard & Waldemar F. Dietrich
"A Manual on Fire Assaying"                                                      Charles Herman Fulton
"The Sampling and Assay of the Precious Metals"                           Ernest Alfred Smith
"Metallurgy of Gold"                                                                                Thomas K. Rose
"The Precious Metals
: comprising Gold, Silver and Platinum"               Thomas K. Rose
"A Text Book of Assaying"                                                   C. Beringer & J. J. Beringer


Bugbee
Shepard
Fulton
Smith
Rose1
Rose2
Beringer

 

 

 

Context: ►Assay Ton  ►Blank  ►Steps   ►Feathers  ►Matte/Speiss  ►Colours  ►Spitting  ►Sprout  ►Surcharge  ►Inquart  Hallmark  ►Cupels

 

Terms: ►Cupellation  ►Fire Assay  ►Reagents  ►Other Methods  ►Metals Sheets: ►Cupels  ►Crucibles  Index: ►Programme