{"id":3849,"date":"2019-11-05T18:28:23","date_gmt":"2019-11-05T18:28:23","guid":{"rendered":"https:\/\/www.gsnv.org\/shop\/porphyry-related-deposits-of-nevada\/"},"modified":"2020-02-24T18:20:54","modified_gmt":"2020-02-24T18:20:54","slug":"porphyry-related-deposits-of-nevada","status":"publish","type":"product","link":"https:\/\/www.gsnv.org\/shop\/porphyry-related-deposits-of-nevada\/","title":{"rendered":"Porphyry-Related Deposits of Nevada"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>Welcome to the Geological Society of Nevada\u2019s 2015 Symposium Field Trip, Porphyry-Related<br \/>\nDeposits of Nevada. When explorationists and miners convene in Nevada, gold deposits and<br \/>\nproduction dominate conversations, but copper should not be considered a deserted step-child. For<br \/>\nexample, 19th century prospectors began mining high-grade copper from skarn deposits in the<br \/>\nYerington district shortly after discovery of the bonanza Au-Ag discoveries at the Comstock Lode.<br \/>\nCopper mining began in earnest during the early 1900\u2019s with the advent of and financial benefit<br \/>\nfrom bulk-tonnage open pit mining in the Ruth mine at Ely, now part of KGHM\u2019s Robinson copper<br \/>\nmine, which operated nearly continuously over a 100+ year history. Major copper production<br \/>\ncontinued during the mid-1950\u2019s when the Anaconda Company commissioned their Yerington mine<br \/>\nin Lyon County followed by, in late 1970\u2019s, another porphyry-hosted deposit, Anaconda\u2019s Hall mine<br \/>\nin Nye County, albeit dominated by molybdenum with minor copper. Modern porphyry exploration<br \/>\nincludes General Moly\u2019s Mount Hope property in Eureka County, representing another<br \/>\nmolybdenum-dominated porphyry deposit.<br \/>\nOur field trip will take us to the Robinson mine at Ely and on to the Yerington district, sharing<br \/>\nsimilarities of porphyry-derived copper mineralization dismembered by Tertiary extensional faulting.<br \/>\nBoth districts include skarn deposits (current mining at Robinson, planned 2016 mining in the<br \/>\nYerington district) hosted in upper Paleozoic and Mesozoic carbonates and calcareous siltstones,<br \/>\nrespectively. Copper mineralization at Robinson derives from mid-Cretaceous monzonite \/ quartz<br \/>\nmonzonite intruded into an upper Paleozoic section that is also credited with gold production from<br \/>\ndeposits peripheral to the copper pits. The Yerington district is currently being explored by three<br \/>\ncompanies with mining planned by Nevada Copper in 2016 on copper-magnetite skarn<br \/>\nmineralization hosted in mid-Triassic \/ early Jurassic carbonates and calcareous siltstones. Copper is<br \/>\nhosted mid-Jurassic granodiorite and quartz monzonite and, significantly, in related dikes which host<br \/>\nmajor copper mineralization at Entr\u00e9e Gold\u2019s Ann Mason deposit and at Singatse Peak Services\u2019<br \/>\nBear sulfide deposit, MacArthur oxide \u2013 sulfide copper deposit, and unmined sulfide mineralization<br \/>\nremaining in the Yerington pit.<br \/>\nThe three-day field trip will depart Reno on Thursday, May 21, arriving in Ely that evening for<br \/>\ndinner and a presentation of Robinson mine geology by KGHM geologists who will tour us through<br \/>\nseveral of the pits at Robinson on Friday morning. Departing Friday afternoon from Ely will take us<br \/>\nback along US Highway 50 to Fernley, then south to overnight in Yerington. Friday\u2019s dinner<br \/>\ndiscussion in Yerington will feature Singatse Peak Services\u2019 (SPS) geologists describing the Bear,<br \/>\nYerington mine, and MacArthur deposits. Saturday morning will begin with visits to SPS\u2019s Yerington<br \/>\nmine, Bear overlook, and MacArthur 4680 bench which will also include Entr\u00e9e Gold geologists<br \/>\npresenting a core shack examination and discussion of their Ann Mason deposit. The Yerington tour<br \/>\nwill conclude with an overview of Nevada Copper\u2019s Pumpkin Hollow deposit at the East \/ E-2<\/p>\n","protected":false},"featured_media":4786,"comment_status":"closed","ping_status":"closed","template":"","meta":{"pmpro_default_level":""},"product_cat":[811],"product_tag":[],"_links":{"self":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product\/3849"}],"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=3849"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media\/4786"}],"wp:attachment":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media?parent=3849"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_cat?post=3849"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_tag?post=3849"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}