Jindalee Lithium Limited (ASX:JLL) has released the initial results from acid leaching conducted on beneficiated samples collected from its McDermitt Lithium Project, announcing extremely high lithium extraction rates were recorded from both the 250micron (µm) and 75µm leach feeds.
Exceptional Metallurgical Results
In October last year, Jindalee released preliminary assay results for metallurgical samples from its wholly owned McDermitt Lithium Project, located in Oregon, USA, which revealed an average head assay of 1790 ppm Lithium, marking a 34 percent increase from the current McDermitt Mineral Resource grade (1,340 ppm Li).
Following this, acid leach testwork was conducted on the samples using attrition scrubbing. The results from the beneficiation of composite samples were impressive, subsequently leading to follow up testing where acid leaching was conducted on the beneficiated samples.
High Lithium Extraction
Jindalee reports samples of ore were beneficiated with a cut-size of 250µm, with material passing either leached directly, the 250µm leach feed, or ground further so that all passed 75µm, the 75µm feed.
The Company reported the results have been exceptional, with extremely high lithium extraction rates recorded from both the 250µm and 75µm leach feeds using 500 kilogram sulphuric acid per tonne of leach feed.
The lithium extraction from composite samples averaged 93% (250µm) and 94% (75µm) with lithium extraction from all units exceeds 98% with higher acid additions.
Table 1: Maximum Lithium Extraction at variable feed sizes and acid strengths – Units 4, 6, 8 and 10 (* calculated)
The leach test work was conducted up to four hours, with the Company noting the majority of lithium extraction occurred within the first hour. This will be beneficial for its upcoming Pre-Feasibility Study, where optimised lithium extraction and acid addition rates will be incorporated.
Jindalee commenced the McDermitt PFS in June last year, with the assistance of global EPCM company Fluor Corporation. Work required for the PFS is progressing well with several preliminary deliverables already achieved. The PFS timeline is anticipated to continue throughout 2024, subject to the timing of metallurgical test results, site investigations and approvals, anticipated to be competed mid year.
Jindalee plans to continue its testing, outlining leaching of a bulk composite has commenced to provide lithium in solution for downstream testwork, with results expected to feed into the PFS.
JLL’s Australian Securities Exchange-listed share price has risen 10.38% and is currently trading at $1.17 (9.00am UTC+ 8 hours).