<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>T.G. Lovering</dc:contributor>
  <dc:contributor>H. W. Lakin</dc:contributor>
  <dc:contributor>A.T. Myers</dc:contributor>
  <dc:creator>L.C. Huff</dc:creator>
  <dc:date>1961</dc:date>
  <dc:description>&lt;p&gt;&lt;span class="ScopusTermHighlight"&gt;Analytical&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;methods&lt;/span&gt;&lt;span&gt;&amp;nbsp;used&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;geochemical&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;prospecting&lt;/span&gt;&lt;span&gt;&amp;nbsp;for&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;copper&lt;/span&gt;&lt;span&gt;&amp;nbsp;were compared by analysis of samples of residual soil collected&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;duplicate near&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;a&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;copper&lt;/span&gt;&lt;span&gt;-bearing vein at the Malachite mine, Jefferson County, Colo.&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;In&lt;/span&gt;&lt;span&gt;&amp;nbsp;this area barren or "background" samples have&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;a&lt;/span&gt;&lt;span&gt;&amp;nbsp;mean&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;copper&lt;/span&gt;&lt;span&gt;&amp;nbsp;content of 58 ppm (parts per million) and anomalous samples containing&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;copper&lt;/span&gt;&lt;span&gt;&amp;nbsp;derived from the vein have&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;a&lt;/span&gt;&lt;span&gt;&amp;nbsp;mean&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;copper&lt;/span&gt;&lt;span&gt; content of 216 ppm. Most anomalous samples are above 100 ppm and most barren samples are below.&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Geochemical&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;prospecting&lt;/span&gt;&lt;span&gt;&amp;nbsp;tests, such as the spectrographic, biquinoline, dithizone and chromograph tests for&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;copper&lt;/span&gt;&lt;span&gt;&amp;nbsp;and the citrate soluble and acid-soluble tests for total heavy metal, are almost as sensitive but are less precise and less accurate than standard quantitative trace analysis. Statistical techniques based chiefly upon the coefficient of variation show that the&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;geochemical&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;prospecting&lt;/span&gt;&lt;span&gt;&amp;nbsp;tests differ considerably among themselves&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;sensitivity, precision, and accuracy. This study indicates that the dithizone and the biquinoline tests for&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;copper&lt;/span&gt;&lt;span&gt;&amp;nbsp;are the best for&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;geochemical&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;prospecting&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;in&lt;/span&gt;&lt;span&gt;&amp;nbsp;this area.&amp;nbsp;&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.2113/gsecongeo.56.5.855</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Society of Economic Geologists</dc:publisher>
  <dc:title>A comparison of analytical methods used in geochemical prospecting for copper</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>