Zenith Minerals Limited (ASX: ZNC) has received results from a program of initial metallurgical tests on REE samples from the Company’s 100% owned Laramie REE project in Wyoming USA.
Positive first pass initial tests show that both of the simple mineral separation techniques assessed will allow upgrading through concentration of the REE minerals from the Company’s 100% owned Laramie REE project
Mineral separation by magnetic methods recovered 87% of the REE minerals into 27% of the mass whilst rejecting 73% of the waste material at a crush size of -0.5mm
Mineral separation using gravity methods recovered 76% of the REE minerals into 22% of the mass whilst rejecting 78% of the waste material at a crush size of -2mm
Samples the subject of testing were coarse low grade (0.27% TREE) residues left over from the recent systematic chip sample traverses that returned results: 80m @ 0.40% TREO and 137m @ 0.37% TREO, indicating potential for large tonnages (ZNC ASX Release 6th Nov 2019)
Results are deemed encouraging, supporting immediate follow-up test work
A 100kg bulk composite surface rock sample was subject to a series of tests to determine if simple magnetic and/or gravity beneficiation techniques at coarse grainsizes can easily upgrade the concentration of REE minerals and reject gangue minerals.
The work being completed by Nagrom at its Western Australian metallurgical test work facility has shown early encouraging results. Mineral separation by magnetic methods recovered 87% of the REE minerals into 27% of the mass at a crush size of -0.5mm, whilst mineral separation using gravity methods recovered 76% of the REE minerals into 22.2% of the mass at a crush size of -2mm.
The magnetic metallurgical tests completed to date were completed on laboratory/pilot scale testing equipment that has “off-the-shelf” industry standard commercial processing equivalents, hence the focus of follow-up work will be using the magnetic separation method.
Stage 2 test work will now assess how easy it is to liberate the REE minerals from the REE concentrate generated by the Phase 1 magnetic separation. The follow-up test will involve finer grinding and subjecting the concentrate to both magnetic and flotation separation methods. This work is planned to recommence shortly.