DEFENSE METALS HYDROMETALLURGY TEST PROGRAM ACHIEVES ~90% RARE EARTH ELEMENT EXTRACTION FROM WICHEEDA FLOTATION CONCENTRATE
February 18, 2020
Vancouver, British Columbia – February 18, 2020: Defense Metals Corp. (“Defense Metals”) (TSX-V:DEFN / OTCQB:DFMTF / FSE:35D) is pleased to announce that it has received final bench-scale hydrometallurgical test program results for the Wicheeda Rare Earth Element Property (“Wicheeda”) from SGS Canada Inc. (“SGS”). Samples of Wicheeda flotation concentrate used in a hydrometallurgical test program led to the successful development of a flowsheet capable of processing the concentrate to a high grade mixed REE hydroxide precipitate. Highlights of the recently completed hydrometallurgical test program include:
Initial processing via mild hydrochloric acid leach to extract gangue minerals while leaving REE (Rare Earth Elements) in the leach residue.
High REE extraction from flotation concentrate of ~ 90% into a chloride based leach solution with opportunities identified to increase recoveries even further.
Simple treatment of the leach solution with limestone achieved high (94-100%) removal of impurities such as iron, phosphorous, and thorium with only minor (2-4 %) REE losses.
Simple treatment of purified liquor with hydrated lime led to the production of a high grade 67.5% TREE (Total REE, see Table 1 for detailed composition) mixed REE hydroxide precipitate at high (99-100%) Critical REE recovery from solution.
Overall recoveries of 70-75% TREE from bulk sample to a high grade mixed REE hydroxide precipitate, and up to 76-78% TREE with reprocessing of the final leach residue.
Regeneration of 20% (w/w) hydrochloric acid from final process liquors for re-use in the leaching operation.
As noted above, flowsheet improvement options have been identified that will be investigated through further testing including: locked cycle testing to investigate effect of recycling regenerated hydrochloric acid and sodium hydroxide; optimization of the gangue leach circuit to limit REE losses; reprocessing of leach residue back to the caustic crack stage to improve overall REE extraction; adoption of two-stage impurity removal process to limit the overall extent of REE co-precipitation; and inclusion of hydrochloric acid and caustic regeneration to reduce overall reagent consumption.
Once optimized, continuous hydrometallurgical pilot plant testing is required to confirm overall circuit operability, to confirm product recoveries, product grades, and reagent consumptions under continuous conditions and to produce bulk quantities of purified mixed REE product for further separation testing.
Details of the process development testwork carried out at SGS will be included in a joint Defense Metals / SGS paper, which will be presented at the “Processing of Critical Materials” Symposium (part of the Conference Of Metallurgists) in August 2020 in Toronto.
Craig Taylor, CEO of Defense Metals, stated; “These hydrometallurgical test results which showed REE extractions of ~90% from flotation concentrate, in conjunction with our recently released locked cycle flotation tests that produced a high grade 48.7% TREO concentrate, conclude a very successful yearlong metallurgical flowsheet optimization process. Defense Metals believes these are exceptional results that show the Wicheeda REE Deposit mineralization is readily amenable to processing via well-established flotation, and hydrochloric acid leach / caustic crack REE extraction methods. Based on these positive results we expect to finalize our plans to commence continuous pilot plant testing in the near future.”
The overall hydrometallurgical flowsheet is chloride based and uses hydrochloric acid to dissolve gangue minerals away from the REE carrying minerals. The REE containing leach residue is subsequently processed in a caustic treatment step to convert REE phosphates and fluorides into acid soluble REE hydroxides. The REE hydroxides are leached in hydrochloric acid and the leach solution is treated to remove impurities such as iron, aluminium, phosphorous and thorium. A purified and mixed REE product suitable for further REE separation can be produced either by hydroxide or oxalate precipitation. Final filtrates from gangue leaching and REE precipitation are combined and reacted with sulphuric acid to produce 20% (w/w) hydrochloric acid for re-use (Figure 1).
About the Wicheeda REE Property
The 1,708 hectare Wicheeda REE Property, located approximately 80 km northeast of the city of Prince George, British Columbia, is readily accessible by all-weather gravel roads and is nearby to infrastructure, including power transmission lines, the CN railway and major highways.
Geologically, the property is situated in the Foreland Belt and within the Rocky Mountain Trench, a major continental geologic feature. The Foreland Belt contains part of a large alkaline igneous province, stretching from the Canadian Cordillera to the southwestern United States, which includes several carbonatite and alkaline intrusive complexes hosting the Aley (niobium), Rock Canyon (REE), and Wicheeda (REE) deposits.
The Wicheeda REE Property is underlain by Kechika Group metasedimentary rocks that are intruded by the southeast-trending Wicheeda carbonatite; a deformed plug or sill approximately 250 metres in diameter that hosts significant REE mineralization. This intrusion comprises a ferroan dolomite carbonatite core, which passes gradationally outward into calcite carbonatite. The REE mineralization is primarily hosted by the dolomitic carbonatite.
The scientific and technical information contained in this news release as it relates to the Wicheeda REE Property has been reviewed and approved by Kristopher J. Raffle, P.Geo. (BC) Principal and Consultant of APEX Geoscience Ltd. of Edmonton, AB, a director of Defense Metals and a “Qualified Person” as defined in National Instrument 43-101 – Standards of Disclosure for Mineral Projects. Mr. Raffle verified the data disclosed which includes a review of the analytical and test data underlying the information and opinions contained therein.
Methodology and QA/QC
Head grade, batch and locked-cycle flotation, and hydrometallurgical product assays for cerium, lanthanum, neodymium and praseodymium oxides were determined via lithium-borate fusion of a 0.5 gram sample analyzed via wavelength dispersion X-ray fluorescence (WD-XRF). The remaining rare earth elements for the head sample were determined via 0.5 gram sodium-peroxide fusion multi-element ICP-MS.
The SGS analyses included a quality assurance / quality control (QA/QC) program including the insertion of rare earth element standard and blank samples. Defense Metals detected no significant QA/QC issues during review of the data. Defense Metals is not aware of any drilling, sampling, recovery or other factors that could materially affect the accuracy or reliability of the data referred to herein. SGS is an ISO/IEC 17025 and ISO9001:2015 accredited laboratory. SGS is independent of Defense Metals Corp.
About Defense Metals Corp.
Defense Metals Corp. is an advanced mineral exploration company focused on the acquisition of mineral deposits containing metals and elements commonly used in the electric power market, military, national security and the production of “GREEN” energy technologies, such as, high strength alloys and rare earth magnets. Defense Metals has an option to acquire 100% of the 1,708 hectare Wicheeda Rare Earth Element Property located near Prince George, British Columbia, Canada. Defense Metals Corp. trades in Canada under the symbol “DEFN” on the TSX Venture Exchange, in the United States, under “DFMTF” on the OTCQB and in Germany on the Frankfurt Exchange under “35D”.
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Forward Looking Information
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