{"id":1116,"date":"2023-11-07T02:24:01","date_gmt":"2023-11-07T02:24:01","guid":{"rendered":"https:\/\/economicherald.net\/?p=1116"},"modified":"2023-11-07T02:24:01","modified_gmt":"2023-11-07T02:24:01","slug":"metallurgical-test-work-illuminates-the-path-forward-at-od6-metals-splinter-rock-project","status":"publish","type":"post","link":"https:\/\/economicherald.net\/?p=1116","title":{"rendered":"Metallurgical test work illuminates the path forward at OD6 Metals\u2019 Splinter Rock project"},"content":{"rendered":"<p>Metallurgical test results confirm low hydrochloric acid consumption at Splinter Rock, returning an average 6kg HCl\/t ore with multiple zones at 6-10kg HCl\/t ore<br \/>\nPositive acid consumptions and recoveries when combined with high grades, low stripping ratios, and substantial tonnages provide considerable confidence in the key economic drivers<br \/>\nFurther metallurgical processing optimisation work is under way<\/p>\n<p>\u00a0<\/p>\n<p><strong><em>Special Report<\/em>: Metallurgical tests conducted by the Australian Nuclear Science Organisation (ANSTO) have confirmed low acid consumption at OD6\u2019s Splinter Rock project near Esperance in WA. <\/strong><\/p>\n<p><a href=\"https:\/\/stockhead.com.au\/company\/od6-metals-od6\/\">OD6 Metals\u2019 (ASX:OD6)<\/a> Splinter Rock project in WA is emerging as one of the largest, highest-grade clay-hosted rare earths projects in Australia.<\/p>\n<p>The project hosts a 344Mt resource at 1,308ppm TREO, which was unveiled less than one year after first drilling a handful of near-surface, 60-70m thick mineralised clay basins.<\/p>\n<p>In comparison to hard rock resources, clay rare earths deposits contain an optimal mix of rare earth elements (REEs) needed for permanent magnets \u2013 a booming market thanks to their use in EVs and wind turbines.<\/p>\n<p>These deposits are potentially easier and more cost effective to mine.<\/p>\n<p>\u00a0<\/p>\n<h2><strong>Metallurgical test work <\/strong><\/h2>\n<p>Around 10 samples were selected from a wide variety of clay and non-clay types at Splinter Rock to test the various mineral recovery variations across four main prospects including Prop, Centre, Scrum and Flanker.<\/p>\n<p>These prospect areas are characterised by a combination of ionically adsorbed, acid soluble and refractory REEs.<\/p>\n<p>Samples were selected based on differing geographic location, REE grade, colour, chemical composition, AEM conductivity, proximity to granite, basinal position (including paleo valley\/channel positions) and inferred different geological genesis.<\/p>\n<p>ANSTO was engaged to complete the second phase of Splinter Rock metallurgical testing given their extensive experience in rare earth process development.<\/p>\n<p>\u00a0<\/p>\n<h2><strong>Impressive leach and recovery responses<\/strong><\/h2>\n<p>Acid optimisation leach tests were conducted under three new acidic conditions on each sample (10, 15 and 20g\/L hydrochloric acid) at notionally ambient temperature and pressures, over a 24-hour period with interim 6, 9 and 12-hour liquor samples to determine leaching kinetics.<\/p>\n<p>Results indicated that:<\/p>\n<p>REE extraction increases with acidity;<br \/>\nExtractions at 15-20g\/L HCl appear to be a balance point on recovery, acid strength and acid consumption;<br \/>\nEach prospect and mineralisation type has slightly different optimal acid conditions;<br \/>\nThere is a notable outlier in Sample SR149A which has both high recovery and high acid consumption; and<br \/>\nNeodymium (Nd), praseodymium (Pr), terbium (Tb) and dysprosium (Dy) have very similar recoveries for each test which is reflected in overall Magnetic Rare Earth (MagRE) percent recovery<\/p>\n<p>The average overall acid consumption was 16kg\/t with a 61% MagRE Recovery at 20g\/l HCl with results from this program demonstrating that utilising the fusion digest assay technique can increase head grade by up to 30% over a four-acid leach assay.<\/p>\n<p>With these results in tow, the explorer is proposing a simplified processing map to deliver rare earth products based on the test work completed to date.<\/p>\n<p>Central to the flowsheet is the use of a site based chlor-alkali facility which utilises salt and water to produce two reagents, namely hydrochloric acid (HCl) and sodium hydroxide (NaOH).<\/p>\n<p>\u00a0<\/p>\n<p>Indicative processing steps. Pic via OD6 Metals<\/p>\n<p>\u00a0<\/p>\n<p>HCl is used to leach the rare earth elements, then NaOH is used to remove impurities, precipitate a mixed rare earth product (MREC\/H) and neutralise the clays prior to in-pit disposal.<\/p>\n<p>\u00a0<\/p>\n<h2><strong>Future development planning <\/strong><\/h2>\n<p>\u201cThese low acid consumption numbers are very positive, validating our proposed processing route and providing confidence in future potential process economics,\u201d OD6 managing director Brett Hazelden says.<\/p>\n<p>\u201cThis represents a key value lever as we continue to tick all the major boxes that pave the way for project development success.<\/p>\n<p>\u201cAs part of future development planning, we have engaged vendors and experts on potentially owning and operating a site-based chlor-alkali facility.<\/p>\n<p>\u201cInitial discussions suggest this route can provide the lowest ongoing operating cost over time, which is important, as we envisage Splinter Rock growing to a multigenerational project, powered by low operating cost renewable energy sources.\u201d<\/p>\n<p>\u00a0<\/p>\n\n<p><span class=\"mce_SELRES_start\">\ufeff<\/span>\u00a0<\/p>\n<p><em>This article was developed in collaboration with OD6 Metals, a Stockhead advertiser at the time of publishing. <\/em><\/p>\n<p><em>\u00a0<\/em><\/p>\n<p><em>This article does not constitute financial product advice. You should consider obtaining independent advice before making any financial decisions.<\/em><\/p>\n<p><span class=\"et_bloom_bottom_trigger\"><\/span><\/p>\n<p>The post <a href=\"https:\/\/stockhead.com.au\/resources\/metallurgical-test-work-illuminates-the-path-forward-at-od6-metals-splinter-rock-project\/\">Metallurgical test work illuminates the path forward at OD6 Metals\u2019 Splinter Rock project<\/a> appeared first on <a href=\"https:\/\/stockhead.com.au\/\">Stockhead<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Metallurgical test results confirm low hydrochloric acid consumption at Splinter Rock, returning an average 6kg HCl\/t ore with multiple zones at 6-10kg HCl\/t ore Positive <a href=\"https:\/\/economicherald.net\/?p=1116\" class=\"read-more-link\">[more&#8230;]<\/a><\/p>\n","protected":false},"author":0,"featured_media":1117,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-1116","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-finance"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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