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Mineralization at Creston is associated with a 53 million year porphyritic quartz monzonite stock which intruded a complex of Proterozoic igneous and metamorphic rocks. Most of the molybdenum mineralization occurs within the Proterozoic Creston Granite, as disseminations in quartz stockworks or in the matrix of breccia zones within areas of intense phyllic alteration.
Metallic minerals include pyrite, molybdenite, subordinate chalcocite and chalcopyrite. Following the emplacement of the mineralization the area underwent several episodes of tectonic activity. The most important structure at Creston is a low angle fault (Creston fault) which separates altered and mineralized upper plate rocks from lower plate lithologies.
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