<?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>H.C. Granger</dc:contributor>
  <dc:creator>C. G. Warren</dc:creator>
  <dc:date>1973</dc:date>
  <dc:description>&lt;p&gt;Roll-type uranium deposits contain both ore-stage pyrite&amp;nbsp;and preore or diagenetic pyrite that was present in the host rock before&amp;nbsp;the deposits began to form. Ore-stage pyrite forms as the result of&amp;nbsp;redistribution and accretion from the preore pyrite. Accretion of the&amp;nbsp;ore-stage pyrite seems to be governed by natural laws that limit its&amp;nbsp;concentration to only a few times the concentration of the preore&amp;nbsp;pyrite. Accumulations of ore-stage pyrite build up along the leading&amp;nbsp;edge of a supergene oxidation zone which spreads through the host&amp;nbsp;rocks, literally pushing the ore deposits ahead of it. The ore-stage pyrite&amp;nbsp;probably progresses much as a wave that first grows to a nearly fixed&amp;nbsp;amplitude and thereafter is steadily maintained as the mature deposit&amp;nbsp;continues to advance.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:language>en</dc:language>
  <dc:publisher>U.S. Geological Survey</dc:publisher>
  <dc:title>The concept of growth and maturity of ore-stage pyrite in roll-type uranium deposts</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>