The geology of the Copper Basin ore deposits, Lander County, Nevada
AuthorTippett, Michael Charles
AdvisorPayne, Anthony L.
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The ore deposits at Copper Basin consist principally of supergene enriched copper minerals contained in arenites of the Cambrian Harmony Formation. Hypogene metallization is thought to be coincident with Eocene quartz monzonites which intrude the host rocks, causing widespread metamorphism. Hypogene ore was introduced via NNE and NNW fissures, filled fissures and replaced metasomatized calcareous shales in the upper part of the Harmony Formation. Subsequent oxidation of hypogene chalcopyrite-pyrrhotite-pyrite tactite zones has formed at least three commercial supergene copper deposits. Important secondary ore controls are fracture intersections with favorable beds, creating permeable conduits for migrating copper-bearing solutions. Considerable alteration of the sediments and intrusive rocks attended the supergene enrichment process.
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supergene enriched copper minerals
Cambrian Harmony Formation
Eocene quartz monzonites
metasomatized calcareous shales
oxidation of hypogene chalcoprite-pyrrhotite-pyrite tactite zones
commercial supergene copper deposits
secondary ore controls
migrating copper-bearing solutions
supergene enrichment process
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