{"id":2420,"date":"2019-10-02T19:52:06","date_gmt":"2019-10-02T19:52:06","guid":{"rendered":"https:\/\/www.gsnv.org\/shop\/airborne-hyperspectral-mineral-mapping-in-regolith-and-variably-weathered-high-grade-metamorphic-sequences-of-the-mineralized-west-pinnacles-area-broken-hill-australia\/"},"modified":"2020-02-24T18:17:32","modified_gmt":"2020-02-24T18:17:32","slug":"airborne-hyperspectral-mineral-mapping-in-regolith-and-variably-weathered-high-grade-metamorphic-sequences-of-the-mineralized-west-pinnacles-area-broken-hill-australia","status":"publish","type":"product","link":"https:\/\/www.gsnv.org\/shop\/airborne-hyperspectral-mineral-mapping-in-regolith-and-variably-weathered-high-grade-metamorphic-sequences-of-the-mineralized-west-pinnacles-area-broken-hill-australia\/","title":{"rendered":"Airborne hyperspectral mineral mapping in regolith and variably weathered high-grade metamorphic sequences of the mineralized West Pinnacles area, Broken Hill, Australia"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<p>The Palaeoproterozoic high-grade metamorphic Broken Hill Block, New South<br \/>\nWales (NSW), Australia, is host to the world-class Broken Hill Pb-Zn-Ag orebody. To<br \/>\nassist mineral exploration in the Block, the NSW Department of Mineral Resources<br \/>\ncommissioned a 4,000 km\u00b2 HyMap airborne hyperspectral survey in 2002 to provide<br \/>\nindustry with data capable of mapping the spectrally identifiable surface mineralogy.<br \/>\nThis paper reports on an evaluation of five HyMap flight-lines at 3 m spatial resolution,<br \/>\ncovering 48 km\u00b2 of mixed outcrop and regolith in the West Pinnacles area, 15 km<br \/>\nsouthwest of the Broken Hill orebody. A new \u2018multi MNF adapted ENVI-Hourglass\u2019<br \/>\nmethod was used to process the multiple HyMap flight-lines. Thirteen minerals were<br \/>\nidentified from the processing and analysis of the airborne data and their distribution<br \/>\nand relative abundance were mapped in the regolith and in outcrop.<br \/>\nMineral map products generated from the HyMap data proved potentially useful<br \/>\nfor mineral exploration in several ways. Many bedrock units were able to be delineated,<br \/>\nincluding retrograde shear zones. The prospective garnet- and gahnite-bearing<br \/>\nrock units were not uniquely identified, possibly due to surface weathering and\/or<br \/>\nsmall outcrop size, however, detrital garnets in stream sediments were identified. Ferich<br \/>\nfacies within prospective lithological units were detected and mark potential sites<br \/>\nof concealed mineralization. Regolith mineral distribution, relative mineral abundance,<br \/>\nprovenance, and dispersion pathways were revealed for the first time. In situ<br \/>\nand transported regolith were distinguished based predominantly on the spectrally<br \/>\ndetermined kaolin crystallinity index. Potential sampling media for geochemical analysis<br \/>\nwere mapped, including goethitic lag for Pb-Zn exploration and pedogenic calcrete<br \/>\n(calcite) for Au exploration.<\/p>\n","protected":false},"featured_media":4188,"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\/2420"}],"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=2420"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media\/4188"}],"wp:attachment":[{"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/media?parent=2420"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_cat?post=2420"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.gsnv.org\/wp-json\/wp\/v2\/product_tag?post=2420"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}