RE: Barry Bargain8 Mar 2019 19:59
Ha ha, greenhaven that’s laughable.
Straight out of the BGS PFS
Metallurgy
The metallurgical process proposed for Goulamina is a conventional process for the beneficiation of spodumene- containing ores to saleable spodumene concentrates.
The process is well tested and involves crushing, reflux classification, DMS, grinding, flotation, magnetic separation, flotation concentrate filtration and bulk transport to the consumer, of a combined DMS/flotation Concentrate. Likely target markets for the Concentrate produced at Goulamina are lithium battery chemical manufacturers servicing the Electric Vehicle (EV) market and other lithium battery uses, such as residential and industrial solar energy storage systems.
Metallurgical testwork has been conducted on 32 composite samples. These composites were developed to represent the spatial variability of the ore across the three known ore zones (Main, West and Sangar) and biased toward the first three years of anticipated ore supply. They were tested against the flowsheet developed for the pre-feasibility study released by the Company on 4 September 2017 (BGS; 4 Sep 2017) and outlined above.
Metallurgical performance of the ore and process flowsheet were not optimised during the metallurgical testwork program and optimisation of both remains a task for any future work.
The testwork program was conducted by Nagrom & Company (Nagrom) in Kelmscott, Western Australia, and ALS Metallurgy Pty Ltd (ALS) in Balcatta, Western Australia, under the supervision of Birimian. Nagrom performed RC and mica removal testwork (including mica picking) and ALS completed the remainder of the testwork program.
The program included: mineralogy; comminution parameters; feed analysis; mineral beneficiation (HLS, milling and flotation) and tailings characterisation.
Overall product grade and recovery determined in the testwork are 5.9% Li2O and 70.4%, respectively.
Based upon preliminary additional testwork, it is considered that optimisation of the flowsheet and conditions during any future FS testwork program will be able to increase the Li2O grade above 6%, while maintaining or increasing overall recovery.
Testwork indicated Concentrate iron levels of 1.35% Fe2O3, which are at the high end of the generally accepted range. Birimian is aware that the current indicated required product specification for the target market to avoid penalties is a maximum of 1.4% Fe2O3 in concentrate. Further metallurgical testwork and investigation into Concentrate iron levels will be undertaken and it is believed that a material reduction in these levels can be achieved at the same or higher metallurgical recovery.
Additional metallurgical testwork in the areas of crush size, grind size and flotation performance has indicated that overall process recovery may be materially improved, however insufficient work has been undertaken to-date to enable such data to be incorporated into the PFS outcomes. Future testwork will aim to both improve
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