assaying

Home > ... > Earth and the Environment > Minerals, Mining, and Metallurgy > Metallurgy and Mining: Terms and Concepts > ...

assaying

The Columbia Encyclopedia, Sixth Edition | 2008 | The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information) Copyright

assaying , in metallurgy, process of determining the specific metallic content of an ore, alloy, or other substance, especially one containing precious metals. It consists, in some cases, of subjecting the substance to complete chemical analysis and, in others, of simply determining the quantity present of one or more of the metal constituents. An accurate assay depends first upon procuring a representative sample of the ore in question. Since distribution of the ore's components is not uniform, a common method employed in obtaining this sample is to procure several samples, crush and mix them together, and from the final mass take the sample to be assayed. Assays are said to be gravimetric when the weight of the metal is determined and volumetric when the analysis involves the volume of the metal in solution as compared to that in a standardized solution. A wet assay (one which involves the use of liquid reagents) is generally used in a determination of weight. In a dry assay the ore is fused and the metal is finally obtained in a pure state.

Hide all research tools
Print this article Print all entries for this topic Cite this article Link to this article
Link to this article

CloseClose

Create a link to this page

Copy and paste this link tag into your Web page or blog:

<a href="http://www.encyclopedia.com/topic/.aspx#1E1-assaying" title="Facts and information about assaying">assaying</a>

Add this article to Del.icio.usBookmark this article on DiigoShare this article on FacebookSubmit this article to RedditGive this article a thumbs-up on StumbleUpon
Show all research tools

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"assaying." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 18 Dec. 2009 <http://www.encyclopedia.com>.

"assaying." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. (December 18, 2009). http://www.encyclopedia.com/doc/1E1-assaying.html

"assaying." The Columbia Encyclopedia, Sixth Edition. 2008. Retrieved December 18, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-assaying.html

Learn more about citation styles

assay

A Dictionary of Earth Sciences | 1999 | | © A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

assay The analysis of minerals and mine products to determine the concentrations of their components.

Hide all research tools
Print this article Print all entries for this topic Cite this article Link to this article
Link to this article

CloseClose

Create a link to this page

Copy and paste this link tag into your Web page or blog:

<a href="http://www.encyclopedia.com/topic/.aspx#1O13-assay" title="Facts and information about assaying">assaying</a>

Add this article to Del.icio.usBookmark this article on DiigoShare this article on FacebookSubmit this article to RedditGive this article a thumbs-up on StumbleUpon
Show all research tools

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

AILSA ALLABY and MICHAEL ALLABY. "assay." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 18 Dec. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "assay." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (December 18, 2009). http://www.encyclopedia.com/doc/1O13-assay.html

AILSA ALLABY and MICHAEL ALLABY. "assay." A Dictionary of Earth Sciences. 1999. Retrieved December 18, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-assay.html

Learn more about citation styles

Free newspaper and magazine articles

Free Article Assaying the tide.(Century marks)(Iraq war)(Brief Article)
Magazine article from: The Christian Century; 9/6/2005
Free Article Assaying Estrogenicity by Quantitating the Expression Levels of Endogenous Estrogen-Regulated Genes.
Magazine article from: Environmental Health Perspectives; 5/1/2000
Free Article Gold View Samples Are in for Assaying.
Business Wire; 6/29/2005

Facts and information from other sites

Related topics

  Edit this list

Related articles from newspapers, magazines, and more

Producing bismuth trioxide and its application in fire assaying
Magazine article from: JOM; 4/1/2002; ; 700+ words ; ...formulations used by mineral analysts in fire assaying. The production of bismuth trioxide...its use in environmentally sound fire assaying. INTRODUCTION Because of cost and environmental...litharge) as a fluxing agent in fire assaying. The need for a low-cost, environmentally...
Ascendant Copper-Results of Check Assaying Program on Junin Property (Ecuador)
Newspaper article from: CCNMatthews Newswire; 6/11/2007; 700+ words ; ...Report(1), Ascendant initiated a check assaying program of selected intervals of historic...the 1990s Program. A summary of check assaying results from the eight holes re- assayed...remaining core in the boxes, and re-assaying one-half of the core. In order to...
Mahak (The Assaying Stone).
Magazine article from: Economic Review; 5/1/1998; ; 700+ words ; (The Assaying Stone) Ms. Najma Khan is a well-known...She has also impartial approach in assaying the merit of the articles, and has no...critiques. Name of the Book: Mahak (The Assaying Stone) Name of the Writer: Ms. Najma...
Delhi's first jewellery assaying centre opened.
News Wire article from: PTI - The Press Trust of India Ltd.; 5/22/2006; 627 words ; Delhi's first jewellery assaying centre opened New Delhi, May 22...jewellery and gems, the capital's first assaying and hallmarking centre was today opened...Dikshit, will provide services for assaying the genuineness of jewellery, gems...
French Inventors Develop Teichoic Acids Assaying Method
News Wire article from: US Fed News Service, Including US State News; 1/22/2008; 519 words ; ...France, have developed teichoic acids assaying methods. According to the U.S. Patent...The invention relates to a method for assaying the teichoic acids present, most commonly...oligosaccharides specific for teichoic acids. The assaying of the specific oligosaccharides can...
Minemakers Limited (ASX: MAK) Announce Re-Assaying Improves Tungsten Outlook In Tasmania
News Wire article from: abnnewswire.net; 1/16/2008; ; 685 words ; ...s Creek programme. ICP and fusion XRF assaying techniques have both indicated that the...was previously obtained from powder XRF assaying. In consequence, an ICP and fusion XRF re-assaying programme for several holes from both Storey...
French Inventor Develops Substrate Element Assaying Method
News Wire article from: US Fed News Service, Including US State News; 1/20/2007; 511 words ; ...France, has developed a method of assaying at least one element in a material including...evaporate, such that a solution for assaying is obtained in which the silicon content...elements to be assayed are conserved; and assaying at least one element contained in the...
California, Kansas Inventors Develop S-Adenosylmethionine Inhibitor Assaying Method
News Wire article from: US Fed News Service, Including US State News; 8/1/2008; 434 words ; ...developed a S-adenosylmethionine inhibitor assaying system. According to the U.S. Patent...present invention relates to methods for assaying inhibitors for S-adenosylhomocysteine hydrolases and assaying inhibitors for S-adenosylmethionine...
SEG TO UNVEIL REAL-TIME SOIL CONTAMINATION ASSAYING SERVICE
PR Newswire; 3/18/1994; 700+ words ; ...unveiled its N-SCAN real-time soil assaying service. N-SCAN, developed by SEG...field survey vehicle from which soil assaying is performed. The N-SCAN Field Survey...in cost than conventional laboratory assaying and provides immediate results. In addition...
California Inventor Develops Alpha-Methylacyl-Coenzyme A Racemase Assaying Method
News Wire article from: US Fed News Service, Including US State News; 7/4/2008; 480 words ; ...methylacyl coenzyme A (CoA) racemase assaying method. According to the U.S. Patent...present invention provides a method for assaying alpha-methylacyl- CoA racemase activity...methylacyl-CoA racemase activity. Kits for assaying alpha-methylacyl-CoA racemase based...

Pictures from Google Image Search

Click to see an enlarged picture
Click to see an enlarged picture
Click to see an enlarged picture

For students and teachers!

Encyclopedia.com provides students and teachers facts, information, and biographies from verified, citable sources, including:

Encyclopedia.com provides students and teachers facts, information, and biographies from verified, citable sources, including:

Popular on Newser:

Monica Lewinsky: Bill Lied

(12/18/2009 12:22:03 AM)

Cougar Seeks $3M for Tiger 'Love Child'

(12/18/2009 12:02:00 PM)

France Mulls Tiger Woods' 'Extra-Marital Asylum' Plea

(12/18/2009 4:02:00 AM)

Elin Hires Top Lawyer for $284M Divorce

(12/18/2009 12:59:00 PM)

Adam Lambert Is What Ails America

(12/18/2009 11:50:03 AM)