{"id":2348,"date":"2019-10-02T19:50:21","date_gmt":"2019-10-02T19:50:21","guid":{"rendered":"https:\/\/www.gsnv.org\/shop\/mineral-paragenesis-and-depositional-model-of-the-hilltop-gold-deposit-lander-county-nevada\/"},"modified":"2020-02-24T18:17:09","modified_gmt":"2020-02-24T18:17:09","slug":"mineral-paragenesis-and-depositional-model-of-the-hilltop-gold-deposit-lander-county-nevada","status":"publish","type":"product","link":"https:\/\/www.gsnv.org\/shop\/mineral-paragenesis-and-depositional-model-of-the-hilltop-gold-deposit-lander-county-nevada\/","title":{"rendered":"Mineral Paragenesis and Depositional Model of the Hilltop Gold Deposit, Lander County, Nevada"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>Abstract<br \/>\nThe Hilltop gold deposit is 29 km southeast of Battle Mountain,<br \/>\nLander County, Nevada, in the northern Shoshone Range. The<br \/>\ndeposit is estimated to contain nearly two million ounces of gold at<br \/>\nan average grade of 0.028 opt. The main host of the gold ore is chert<br \/>\nand argillite with minor siltstone and quartzite of the Ordovician<br \/>\nValmy Formation, within the upper plate of the Roberts Mountains<br \/>\nallochthon. Minor to moderate amounts of Tertiary intrusive stocks<br \/>\nand sills are also present. Two sub-parallel west-dipping faults<br \/>\nserved as conduits for mineralization. Thrust movement followed by<br \/>\nBasin-and-Range style extension along both faults before and during<br \/>\nmineralization created a highly permeable megabreccia (termed the<br \/>\nmain zone) which received later igneous intrusions and hydrothermal<br \/>\nfluid deposition. A discordant quartz breccia pipe of uncertain<br \/>\nparagenetic position hosts both main zone and porphyry-related(?)<br \/>\nmineral concentrations.<br \/>\nInitial weak porphyry-style Cu-Mo-Au mineralization<br \/>\nthroughout the Hilltop area is probably associated with a 41.2\u00b10.5<br \/>\nMa west-northwest trend of diorite-granodiorite intrusions. The porphyry<br \/>\nmineralization is localized around the periphery of the intrusions.<br \/>\nPrecious metal mineralization within the main zone followed<br \/>\nthe porphyry event and consists of at least six temporally distinct but<br \/>\nspatially overlapping events. Main zone mineralization exhibits<br \/>\ncharacteristics of both high- and low- sulfidation epithermal systems.<br \/>\nGold is associated with silica and arsenopyrite in three of six<br \/>\nmain zone mineralization events and shows no affinity for a particular<br \/>\nhost rock type.<br \/>\nHydrothermal alteration of the Valmy Formation is predominantly<br \/>\nbleaching (removal of organic carbon) and recrystallization\/<br \/>\nsilicification resulting from the emplacement of Tertiary<br \/>\nigneous intrusions. Tertiary igneous units exhibit typical phyllic<br \/>\nalteration with local argillic alteration.<\/p>\n","protected":false},"featured_media":4068,"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\/2348"}],"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=2348"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media\/4068"}],"wp:attachment":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media?parent=2348"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_cat?post=2348"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_tag?post=2348"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}