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Essential Fire Assay Terms

13-Mar-17

TContext02_Blank.doc

as used in Textbooks

"Blank Assay" - "Blank Test"

Author

Context

Shepard

The best reagents obtainable for assaying contain some gold and silver. As a rule, the amount is so small that it may be neglected, but this point should always be determined by "blank" assays of the reagents. Each new lot of reagents should be tested by a blank assay, made with assay silica that is treated as a quartz ore (p. 228).

Smith

The fluxes and other reagents commonly employed in dry assaying do not contain silver or gold, but if they are left exposed in the laboratory they sometimes become accidentally (and perhaps purposely) contaminated or "salted" with material containing gold and silver values.

A blank assay (that is, a charge in which the ore is omitted) of the reagents will readily determine whether any precious metal is present. (p. 145 -146)

Smith

The mercury used must be free from gold and silver. As the commercial mercury may contain an appreciable amount of gold and silver it is desirable to run a blank assay on 50 cm3 to determine the amount present. (p. 239)

 

 

 

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blank test

leere Probe

leeg proef

essai en blanc

prova in bianco

prueba en blanco

холостая проба

 

 

 

 

 

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Fire Assay

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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