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Thompson-Howarth method

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Journal Article
Published: 01 May 2008
Geochemistry: Exploration, Environment, Analysis (2008) 8 (2): 173–182.
...-sample method, as defined by Thompson and Howarth, which relies on an assumption that the measurement errors are normally distributed, produces significantly biased results when the errors are not normally distributed. Four examples of quality control data-sets from a variety of mineral deposit types...
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Journal Article
Published: 01 July 2008
Exploration and Mining Geology (2008) 17 (3-4): 131–144.
... discusses techniques used for estimation of errors in precision and accuracy, and overviews diagnostic tools. It is shown that one of the most commonly used methods, the Thompson-Howarth technique, produces consistently lower results than other methods. These results reflect the nature of this method, which...
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Evaluation of analytical error in the measurement of Au concentration in th...
Published: 09 May 2019
Fig. 2. Evaluation of analytical error in the measurement of Au concentration in the Alut area based on the Thompson & Howarth (1978) method. The error content is estimated to be above 10%.
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Modified <span class="search-highlight">Thompson</span>-<span class="search-highlight">Howarth</span> duplicate error scatterplot ( Stanley 2003 ) for ...
Published: 10 July 2014
Fig. 4. Modified Thompson-Howarth duplicate error scatterplot ( Stanley 2003 ) for the 89 powder duplicate Au assays (g/t) in a priori dataset # 2 and used to determine the magnitude of ‘other’ error used to illustrate the a priori duplicate analysis method. The calculated total ‘other
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Modified <span class="search-highlight">Thompson</span>-<span class="search-highlight">Howarth</span> duplicate error scatterplot ( Stanley 2003 ) for ...
Published: 10 July 2014
Fig. 6. Modified Thompson-Howarth duplicate error scatterplot ( Stanley 2003 ) for the powder duplicate Au assays (g/t) in a posteriori dataset # 2 and used to determine whether significant inter-batch bias exists in duplicate analyses used to illustrate the a posteriori method of duplicate
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Modified <span class="search-highlight">Thompson</span>-<span class="search-highlight">Howarth</span> duplicate error scatterplot ( Stanley 2003 ) for ...
Published: 10 July 2014
Fig. 3. Modified Thompson-Howarth duplicate error scatterplot ( Stanley 2003 ) for the ¼ core-¼ core duplicate Au assays (g/t) in a priori dataset # 1 and used to illustrate the a priori duplicate analysis method. The calculated total ¼ core relative error is 55.88% (steeper dashed line
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Modified <span class="search-highlight">Thompson</span>-<span class="search-highlight">Howarth</span> duplicate error scatterplot ( Stanley 2003 ) for ...
Published: 10 July 2014
Fig. 7. Modified Thompson-Howarth duplicate error scatterplot ( Stanley 2003 ) for the ½ core-¼ core sample duplicate Au assays (g/t) in a posteriori dataset # 1 and used to illustrate the a posteriori method of duplicate analysis. The calculated total ½ core-¼ core relative error is 44.23
Journal Article
Published: 01 July 2007
Exploration and Mining Geology (2007) 16 (3-4): 267–275.
... functions for the display of Thompson-Howarth plots : Computers and Geosciences , v. 29 , p. 239 – 242 . Howarth , R.J. , and Thompson , M. , 1976 , Duplicate analysis in practice—Part 1: Examination of proposed methods and examples of its use : The Analyst , v. 101 , p. 699 – 709...
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Journal Article
Published: 01 August 2010
Geochemistry: Exploration, Environment, Analysis (2010) 10 (3): 289–315.
... far as their nature and matrix were concerned, of the field samples being analysed, and that the method could only provide either an estimate of analytical precision (repeatability) at a particular concentration, or an average precision value over the concentration range. Thompson & Howarth...
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Journal Article
Published: 01 November 2006
Geochemistry: Exploration, Environment, Analysis (2006) 6 (4): 357–368.
... and error directly from the means and standard deviations of duplicate determinations. Thompson and Howarth's method addresses this problem by sorting the duplicate data in ascending order based on the duplicate means, and then calculating the average mean and median standard deviation (or absolute...
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Journal Article
Published: 22 April 2024
Geochemistry: Exploration, Environment, Analysis (2024) 24 (2): geochem2023-046.
..., precision for many base-metal projects is less problematic as economic concentrations are many orders of magnitude higher than for gold projects and the host minerals, like sulfides, are more