{"id":2313,"date":"2019-10-02T19:49:19","date_gmt":"2019-10-02T19:49:19","guid":{"rendered":"https:\/\/www.gsnv.org\/shop\/paleozoic-structural-controls-on-tertiary-gold-mineralization-in-the-gold-canyon-deposit-eureka-county-nevada\/"},"modified":"2020-02-24T18:16:58","modified_gmt":"2020-02-24T18:16:58","slug":"paleozoic-structural-controls-on-tertiary-gold-mineralization-in-the-gold-canyon-deposit-eureka-county-nevada","status":"publish","type":"product","link":"https:\/\/www.gsnv.org\/shop\/paleozoic-structural-controls-on-tertiary-gold-mineralization-in-the-gold-canyon-deposit-eureka-county-nevada\/","title":{"rendered":"Paleozoic Structural Controls on Tertiary Gold Mineralization in the Gold Canyon Deposit, Eureka County, Nevada"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p><strong>ABSTRACT<\/strong><br \/>\nThe Gold Canyon gold deposit in the Gold Bar district in the<br \/>\nsouthern Roberts Mountains has a resource of 140k oz. Au (average<br \/>\ngrade 0.056 opt), 41k oz recovered. It is a sedimentary rock-hosted<br \/>\ndisseminated gold deposit in the lower plate of the Roberts Mountain<br \/>\nthrust (RMT). Host rocks are Unit 2 of the Devonian Upper Denay<br \/>\nLimestone, and jasperoid breccia. A large pipe-like jasperoid at the<br \/>\ncenter of the orebody produced gold grades ranging from 0.1-0.3 opt.<br \/>\nStructure, lithology and alteration mapping show a spatial correlation<br \/>\nbetween the high-grade jasperoid breccia, north-northwest-trending<br \/>\nnormal faults, and a zone of thrust faults and overturned folds. This<br \/>\ncorrelation suggests that pre-mineralization structure of Paleozoic or<br \/>\nMesozoic age controlled the location of Tertiary normal faults and<br \/>\nrelated fluid flow and mineralization.<br \/>\nWhereas bedding mostly dips gently to the northeast, a 90-meter<br \/>\nwide fault block between two northeast-trending faults contains<br \/>\ninclined to overturned east-northeast-vergent, subhorizontal folds,<br \/>\nlow-angle thrust faults, jasperoid breccia, and high-grade Au ore. The<br \/>\ngeometry and asymmetry of folds is not consistent with the direction<br \/>\nof movement along the normal faults. Rather, the folds are faultpropagation<br \/>\nfolds typically associated with thrust faults.<br \/>\nA structural model for the Gold Canyon deposit is proposed.<br \/>\nPaleozoic or Mesozoic thrust faulting and associated east-northeastvergent<br \/>\nfault propagation folding occurred in lower plate rocks below<br \/>\nthe RMT. During Tertiary extension, normal faults developed on<br \/>\neither side of this folded and faulted zone, essentially reactivating the<br \/>\nweak imbricate structure. Hydrothermal fluid flow, brecciation, silicification<br \/>\n(jasperoid formation) and Au mineralization were thus<br \/>\nfocused along this pre-Tertiary structural zone. Mineralization along<br \/>\nnorthwest-trending faults was amplified where northeast structural<br \/>\nfeeders intersected. The important conclusion from this structural<br \/>\nanalysis is that Paleozoic or Mesozoic contractional structures (thrust<br \/>\nfaults, fault-propagation folds) in the lower plate are important controls<br \/>\non northwest-trending mineralization. Exploration efforts in the<br \/>\nlower plate of the RMT should focus on Paleozoic or Mesozoic contractional<br \/>\nstructures where they may have been reactivated by<br \/>\nTertiary normal faults.<\/p>\n","protected":false},"featured_media":4087,"comment_status":"closed","ping_status":"closed","template":"","meta":{"pmpro_default_level":""},"product_cat":[154],"product_tag":[],"_links":{"self":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product\/2313"}],"collection":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/comments?post=2313"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media\/4087"}],"wp:attachment":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media?parent=2313"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_cat?post=2313"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_tag?post=2313"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}